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g t911: 5-point capacitive touch controller for small-sized mid 1 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. GT911 5-point capacitive touch controller for small-sized mid rev.09 march 11, 2015 = ===== disclaimer ====== the information concerning the device in this publication is intended for you only and is subject to change without prior notice. it is your responsibility to ensure its application complies with technical specifications. shenzhen huiding technology co., ltd. (hereafter referred to as goodix) makes no representation or guarantee for this information, either expressed or implied, written or verbal, statutory or otherwise including but not limited to representation or guarantee for its application, quality, performance, merchantability or fitness for a particular purpose. goodix shall assume no responsibility for this information and relevant consequences arising out of the use of such information. without written consent of goodix, it is prohibited to use goodix products as critical components in any life support system. this document conveys no licenses, implicitly or otherwise, to any intellectual property rights belonging to goodix or any other entities.
g t911: 5-point capacitive touch controller for small-sized mid 2 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. contents 1. overview ........................................................................................................................................................ 4 2. features ......................................................................................................................................................... 4 3. block diagram ............................................................................................................................................... 5 4. pin configurations ........................................................................................................................................ 6 5. sensor design .............................................................................................................................................. 7 5.1 layout of rx channels ........................................................................................................................ 7 5.2 layout of tx channels ........................................................................................................................ 7 5.3 sensor design specifications ............................................................................................................ 7 5.4 touch key design ................................................................................................................................ 8 6. i 2 c communication ...................................................................................................................................... 9 6.1 i 2 c timing .......................................................................................................................................... 9 a) data transmission ..................................................................................................................... 11 b) writing data to GT911 ............................................................................................................... 11 c) reading data from GT911 ....................................................................................................... 12 7. hotknot mode ............................................................................................................................................. 13 7.1 start hotknot ...................................................................................................................................... 13 7.2 data transmission between tps ..................................................................................................... 13 7.3 host receives data from GT911 ..................................................................................................... 13 8. description on functions .......................................................................................................................... 14 8.1 operating modes ............................................................................................................................ 14 a) normal mode .............................................................................................................................. 14 b) green mode ................................................................................................................................ 15 c) gesture mode ............................................................................................................................. 15
g t911: 5-point capacitive touch controller for small-sized mid 3 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. d) sleep mode ................................................................................................................................. 15 e) approach mode .......................................................................................................................... 15 f) receive mode ............................................................................................................................. 16 g) send mode .................................................................................................................................. 16 8.2 interrupt triggering mechanism ................................................................................................... 16 8.3 sleep mode ..................................................................................................................................... 17 8.4 stationary configuration ............................................................................................................... 17 8.5 adaptive frequency hopping ...................................................................................................... 17 8.6 self-calibration ................................................................................................................................ 17 a) self-calibration during initialization ......................................................................................... 17 b) automatic drift compensation ................................................................................................. 17 9. sample schematic ..................................................................................................................................... 18 10. electrical characteristics .................................................................................................................. 19 10.1 absolute maximum ratings ......................................................................................................... 19 10.2 recommended operating conditions ........................................................................................ 19 10.3 ac electrical characteristics ........................................................................................................ 19 10.4 dc electrical characteristics ....................................................................................................... 20 11. package ............................................................................................................................................... 21 12. revision history ................................................................................................................................. 22 13. contact information ........................................................................................................................... 23
g t911: 5-point capacitive touch controller for small-sized mid 4 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. 1 .overview GT911, a new-generation 5-point capacitive touch solution designed for 7 to 8 mid, consists of up to 26 transmitter electrodes and 14 receiver electrodes to provide higher touch accuracy. GT911 supports up to 5 concurrent touches with real-time tracking of accurate position and motion trajectory as well as touch area. furthermore, it is able to report such information to the host as required. 2 .features ? built-in capacitive sensing circuit and high-performance mpu ? report rate: 100hz ? outputs touch coordinates in real time ? unified software applicable to capacitive touch screens of various sizes ? single power supply, internal 1.8v ldo ? flash embedded; in-system reprogrammable ? h otknot integrated ? capacitive touch sensor ? channels: 26 (tx channels)*14 (rx channels) ? s upports capacitive touch screen sizes: 7 to 8 ? supports touch key design on fpc ? s upports ito glass and ito film ? c over lens thickness supported: 0.55mm Q glass Q 2mm, 0.5mm Q pmma Q 1.2mm, (for detail, please refer to sensor design guidelines ) ? adaptive frequency hopping ? supports ogs full lamination ? hotknot ? t ransmission rate 7.0kbps(max) ? d ata frame maximum capacity 128 bytes ? a pplicable sensor types: ogs/traditional gff/gg/gf ? environmental adaptability ? self-calibration during initialization ? automatic drift compensation ? operating temperature: -40 to +85 ; humidity: Q 95%rh ? storage temperature: -60 to +125 ; humidity: Q 95%rh
g t911: 5-point capacitive touch controller for small-sized mid 5 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. ? host interface ? standard i 2 c interface ? works in slave mode ? supports 1.8v to 3.3v host interface voltage ? response time ? green mode: <48ms ? sleep mode: <200ms ? initialization: <200ms ? power supply voltage: ? s ingle supply: 2.8v to 3.3v ? power supply ripple: ? vpp Q 50mv ? package: 52 pins, 6mm*6mm*0.8mm, qfn 0.4mm pitch ? tools provided to support application development: ? touch panel module parameter detector and auto-generator ? touch panel module performance test tool ? m p test tool ? reference driver code and documentary guide for host software development 3.block diagram
g t911: 5-point capacitive touch controller for small-sized mid 6 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. 4 .pin configurations p in no. n ame f unction description r emarks 1 ~11 s en3 to sen13 r eceiver electrodes o utput drive signal while hotknot function is on 1 2 avdd28 analog power 2.2uf filter capacitor to gnd 1 3 a vdd18 2 .2uf filter capacitor to gnd 1 4 dvdd12 2.2uf filter capacitor to gnd 15 dgnd digital signal ground 16 i nt i nterrupt signal register configurable 17 sensor_opt1 module id pin 18 s ensor_opt2 m odule id pin e xternal pull-down resistor required 19 i2c_sda i 2 c data signal 2 0 i 2c_scl i 2 c c lock signal 2 1 v ddio s upply voltage of gpio 2.2uf filter capacitor to gnd floating: 1.8v connect to avdd: avdd 2 2 /r stb r eset pin e xternal 10k pull-up resistor required, active-low reset 2 3~48 drv25 to drv0 transmitter electrodes 4 9 a gnd a nalog signal ground 50~52 sen0 to sen2 receiver electrodes output drive signal while hotknot function is on
g t911: 5-point capacitive touch controller for small-sized mid 7 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. 5 .sensor design 5.1 layout of rx channels sens0 to sens13 are 14 rx channels on the chip directly connected to 14 ito rx channels on the sensor either in sequence or reverse sequence. please refer to the tool gt9 series channel selector for channel selection when there are less ito rx channels on the sensor than rx channels on the chip. sample layout: the ito rx channels on the sensor are connected to the rx channels on the chip in sequence from sens0 to sens13: 5.2 layout of tx channels d rv0 to drv25 are 26 tx channels on the chip directly connected to 26 ito tx channels on the sensor. please refer to the tool gt9 series channel selector for channel selection and assignment. after the layout of the tx channels is determined, relevant registers of GT911 shall be configured to ensure logic positions of tx channels are consistent with their physical positions, so that the reported coordinates match the physical coordinates. for details of sensor design, please refer to layout guidelines. 5.3 sensor design specifications dito limit sito limit tx trace impedance Q 3k? Q 3k? tx channel impedance Q 1 0k? Q 1 0k? rx trace impedance Q 10k? Q 10k? r x channel impedance Q 40k? Q 10k? n ode capacitance Q 4p f Q 4p f
g t911: 5-point capacitive touch controller for small-sized mid 8 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. note: 1) for detailed sensor design specifications, please refer to sensor design guidelines of goodix. 2) when metal traces are employed for routing, some traces may be oxidized due to process control or other reasons and their impedance will become larger, making the impedance vary between traces. when ito are employed for routing, though weve done our utmost to obtain impedance consistency by using matched length and width in design, there are still differences. to ensure data consistency and uniformity on the entire screen, it is necessary to ensure the sensor design complies with the above requirements. 3) in addition, when tx trace and rx trace are adjacent and parallel to each other, separate the traces with a ground trace. for ground trace width, please refer to sensor design guidelines . note that ground trace width should not be less than 0.2mm. 5.4 touch key design GT911 supports at most 4 separated touch keys in the following two ways: 1) rx channel extension : take one tx channel as a common port for the touch keys and connect t he tx channel to four rx channels to enable four touch keys. the touch keys must not share their tx channel with the touch screen. however, rx channels have to be shared. 2) touch key design on fpc: connect one separate tx channel to four rx channels to enable four touch keys. the touch keys have to share their rx channels with the touch screen. touch key pattern on fpc should be designed independently.
g t911: 5-point capacitive touch controller for small-sized mid 9 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. 6 .i 2 c communication 6.1 i 2 c timing GT911 provides a standard i 2 c interface for scl and sda to communicate with the host. GT911 always serves as slave device in the system with all communication being initialized by the host. it is strongly recommended that transmission rate be kept at or below 400kbps. the i 2 c timing is shown below: test condition 1: 1.8v host interface voltage, 400kbps transmission rate, 2k pull-up resistor p arameter s ymbol m in. m ax. u nit scl low period t l o 1.3 - us scl high period t h i 0.6 - us s cl setup time for start condition t s t1 0 .6 - u s s cl setup time for stop condition t st3 0 .6 - u s scl hold time for start condition t hd1 0.6 - us sda setup time t s t2 0.1 - us s da hold time t hd2 0 - u s test condition 2: 3.3v host interface voltage, 400kbps transmission rate, 2k pull-up resistor parameter symbol min. max. unit scl low period t lo 1.3 - us s cl high period t hi 0 .6 - u s scl setup time for start condition t st1 0.6 - us scl setup time for stop condition t s t3 0.6 - us scl hold time for start condition t h d1 0.6 - us sda setup time t st2 0.1 - us sda hold time t hd2 0 - us GT911 supports two i 2 c slave addresses: 0xba/0xbb and 0x28/0x29. the host can select the address by changing the status of reset and int pins during the power-on initialization phase. see the diagram below for configuration methods and timings:
g t911: 5-point capacitive touch controller for small-sized mid 1 0 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. power-on timing: timing for host resetting GT911: timing for setting slave address to 0x28/0x29: timing for setting slave address to 0xba/0xbb:
g t911: 5-point capacitive touch controller for small-sized mid 1 1 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. a) data transmission ( for example device address is 0xba/0xbb) communication is always initiated by the host. valid start condition is signaled by pulling sda line from high to low when scl line is high. data flow or address is transmitted after the start condition. all slave devices connected to i 2 c bus should detect the 8-bit address issued after start condition and send the correct ack. after receiving matching address, GT911 acknowledges by configuring sda line as output port and pulling sda line low during the ninth scl cycle. when receiving unmatched address, namely, not 0xba or 0xbb, GT911 will stay in an idle state. for data bytes on sda, each of 9 serial bits will be sent on nine scl cycles. each data byte consists of 8 valid data bits and one ack or nack bit sent by the recipient. the data transmission is valid when scl line is high. when communication is completed, the host will issue the stop condition. stop condition implies the transition of sda line from low to high when scl line is high. b ) writing data to GT911 ( for example device address is 0xba/0xbb) t iming for write operation the diagram above displays the timing sequence of the host writing data onto GT911. first, the host issues a start condition. then, the host sends 0xba (address bits and r/w bit; r/w bit as 0 indicates write operation) to the slave device. after receiving ack, the host sends the 16-bit register address (where writing starts) and the 8-bit data bytes (to be written onto the register). the location of the register address pointer will automatically add 1 after every write operation. therefore, when the host needs to perform write operations on a group of registers of continuous addresses, it is able to write continuously. the write operation is terminated when the host issues the stop condition.
g t911: 5-point capacitive touch controller for small-sized mid 1 2 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. c) reading data from GT911 (for example device address is 0xba/0xbb) t iming for read operation the diagram above is the timing sequence of the host reading data from GT911. first, the host issues a start condition and sends 0xba (address bits and r/w bit; r/w bit as 0 indicates write operation) to the slave device. after receiving ack, the host sends the 16-bit register address (where reading starts) to the slave device. then the host sets register addresses which need to be read. also after receiving ack, the host issues the start condition once again and sends 0xbb (read operation). after receiving ack, the host starts to read data. GT911 also supports continuous read operation and, by default, reads data continuously. whenever receiving a byte of data, the host sends an ack signal indicating successful reception. after receiving the last byte of data, the host sends a nack signal followed by a stop condition which terminates communication.
g t911: 5-point capacitive touch controller for small-sized mid 1 3 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. 7 .hotknot mode 7.1 start hotknot when data needs to be sent, the host sends command 0x21 to gt9, enabling GT911 to enter " approach mode" and work as a transmitting terminal. GT911 will then be able to detect the receiving terminal communicating with it. when GT911 succeeds in detecting the receiving terminal, it will notify the the host to shut off lcd using an interrupt signal and then transmit data to the receiveing terminal. 7 .2 data transmission between tps after GT911 and another hotknot terminal successfully detect one another, the host downloads hotknot transmission firmware and sends the firmware to both terminals. while the transmission firmware runs, the two terminals are ready for data transmission, entering receive mode by default. when the GT911 transmit buffer is refreshed correctly, GT911 works as the transmitting terminal and immediately transmits data to the other hotknot terminal, which works as a receiving terminal detecting data sent by GT911. 7 .3 host receives data from GT911 f ollowing recieval or transmission of a data frame, GT911 inverts int to notify the host to process data. after receiving a data frame, the the host reads the value of the hotknot-featured status register. if the value of the receive-status register indicates a successful reception, the host will read the data from the receive buffer via i 2 c. after reading the recieved data, the host writes 0xaa to the designated address and notifies GT911 that data reading is complete. after GT911 transmits a data frame, the host reads the value of the hotknot-featured status register. if the value of the transmit-status register indicates a successful transmission, the host will read the data from the transmit buffer via i 2 c. after reading this data, the host writes 0xaa to the designated address and notifies GT911 that data reading is complete. GT911 will automatically switch to receive mode and will not start transmitting until transmit buffer is refreshed again.
g t911: 5-point capacitive touch controller for small-sized mid 1 4 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. 8 .description on functions 8.1 operating modes a ) normal mode when GT911 is operating in normal mode, its minimum coordinate refresh cycle is 7ms-10ms (subject to configuration; one step is 1ms). when no touch occurs for a certain period (0s to 15s, subject to configuration; one step is 1s) in normal mode, GT911 will automatically switch to green mode to reduce power consumption.
g t911: 5-point capacitive touch controller for small-sized mid 1 5 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. b) green mode in green mode, the scanning cycle for GT911 is about 40ms. it automatically enters normal mode if any touch is detected. c) gesture mode after the host enables GT911 to enter gesture mode by sending i2c command 8 to 0x8046 and then to 0x8040, wake-up can be achieved by swipe, double-tap, or writing of specified letters on tp. in gesture mode, when GT911 detects any finger swipe on tp for a sufficiently long distance, int will output a pulse for longer than 250us or a high level causing the host to wake up and turn on the screen. in gesture mode, when GT911 detects any double-tap on tp, int will output a pulse for longer than 250us or a high level causing the host to wake up and turn on the screen. in gesture mode, when GT911 detects any writing of specified letters on the tp, int will output a pulse for longer than 250us or a high level causing the host to wake up and turn on the screen. d) sleep mode GT911 enters sleep mode if it receives corresponding i 2 c command from the host (requires int output low before the command). GT911 exits sleep mode and enters normal mode when host outputs a high level to int pin for 2ms to 5ms. the interval between sending screen-off command and wake-up should be longer than 58ms. e) approach mode when hotknot proximity detection is enabled, GT911 operates in approach mode by default. if GT911 exits approach mode, the host can enable it to enter approach mode again by sending command 0x20 or 0x21. in approach mode, touch detection and near-field proximity detection alternate.
g t911: 5-point capacitive touch controller for small-sized mid 1 6 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. if the host sends 0x21 to GT911, GT911 will work as a transmitting terminal and transmit signals with a specified pattern and frequency via tx and rx channels. then, GT911 detects whether there are feedback signals with the same specified pattern and frequency from the receiving terminal. this helps to determine whether any receiving terminal exists. if the host sends 0x20 to gt9, GT911 will work as a receiving terminal and detect signals with a specified pattern and frequency from the transmitting terminal. if such a signal is detected, GT911 responds using signals with the specified pattern and frequency to the transmitting terminal. in approach mode, when detecting any hotknot-compatible terminal within the near-field range, GT911 will notify the host via int to capture status. to ensure reliable detection between the transmitting terminal and the receiving terminal, it is required to keep detecting for a minimum of 150ms after the two terminals have detected each other. then the host downloads and sends hotknot transmission firmware to enable GT911 to enter receive mode. f ) receive mode in approach mode, after notified that GT911 has successfully detected another hotknot terminal, the host downloads and sends hotknot transmission firmware to enable GT911 to enter receive mode. in receive mode, GT911 continues to detect frame start signal, once the signal is detected, GT911 begins to detect and receive data. when the receiving process is completed, GT911 verifies the data. if GT911 finds erroneous data, the receiving process begins again. if the data is found to be correct, GT911 notifies the host via int to read data in the receive buffer. g ) send mode w hen GT911 works in receive mode, the host sends outgoing data to the transmit buffer. when detecting that the transmit buffer is refreshed and there is data to be sent, GT911 automatically switches from receive mode to send mode. in send mode, GT911 sends a frame start signal. if it detects ack fed back from the receiving terminal, it continues to send the data signal. after sending a data chunk, GT911 begins to detect ack. if it does not detect any ack or if it detects an erroneous ack, GT911 will resend the data chunk. if this resending fails over 5 times, it will resend the current data frame another time to the receiving terminal until the host enables GT911 to exit send mode due to timeout. if GT911 detects ack and sends the data successfully, it will automatically switch to receive mode after the host completes the data processing or due to timeout. 8.2 interrupt triggering mechanism when touched, GT911 sends a pulse via int pin in every scanning cycle to notify the host to read coordinates. host will then set a triggering mechanism via relevant register int bit. int as 0 indicates rising edge-triggered, which means GT911 will notify the host by driving int output from low to high when operated by user; int as 1 indicates falling edge-triggered, which means GT911 will notify the host by pulling int output from high to low when operated by user .
g t911: 5-point capacitive touch controller for small-sized mid 1 7 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. 8.3 sleep mode when the touch screen is off or there are no running operations on the tp, the host sends i 2 c command to enable GT911 to enter sleep mode, which reduces power consumption. when GT911 needs to operate, the host outputs a high level to int pin for a certain period to awake it. for detailed timings of host enabling GT911 to enter and exit sleep mode, please refer to section 8.1. 8 .4 stationary configuration GT911 supports stationary configuration. after receiving configuration parameters from the host, GT911 will fix parameters to the latest version. once these parameters are fixed, GT911 will communicate with the host solely via i2c bus and will not receive any parameters of previous versions from the host. 8.5 adaptive frequency hopping GT911 is equipped with reliable anti-interference hardware. when the drive spectrum of GT911 overlaps with the peak spectrum of noise signal, GT911 will switch to another frequency using a self-adaptive frequency hopping mechanism to avoid interference. 8 .6 self-calibration a ) self-calibration during initialization f luctuations in temperature, humidity and environment may affect the reference capacitance of the capacitive sensor in idle state. GT911 will update detection reference capacitance according to environmental conditions within the first 200ms of initialization. then, GT911 will complete the initialization of the tp test. b ) automatic drift compensation g radual changes in environmental factors such as temperature, humidity, or dust may also affect the reference capacitance of the capacitive sensor in idle state. GT911 will detect real-time changes in data and perform statistic analysis of historic data to revise reference capacitance and thus reduce the impact that environmental changes have on the tp test.
g t911: 5-point capacitive touch controller for small-sized mid 1 8 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. 9 .sample schematic / rst a vdd d rv0 d rv22 d rv1 d rv24 d rv23 d rv3 d rv2 d rv25 d rv8 d rv6 d rv5 d rv4 d rv7 d rv9 d rv12 d rv13 d rv11 d rv10 d rv15 d rv14 d rv17 d rv18 d rv16 d rv20 d rv19 a vdd18 a vdd d vdd12 a vdd18 s ens0 s ens1 s ens3 s ens2 s ens5 s ens4 s ens7 s ens6 s ens9 s ens8 j 2 drv interf ace 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 size project name rev date: sheet o f shenzhen huiding technology co.,ltd. g t911 2.4 custom 1 1monday , march 09, 2015 s ens8 s ens12 s ens9 s ens10 s ens11 s ens13 d rv23 d rv22 d rv24 d rv25 o pt1 j 1 sens interf ace 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 s _opt2 2 1 3 3 00k o pt1 o pt2 s _opt2 2 1 3 r 6 300k v ddio s _opt1 d rv21 o pt2 s ensor id connection methods f or cof v ddio gnd s_opt2 gnd nc 300k gnd gndvddio 300k 300k s ens13 s ens10 s ens11 gnd nc s ens12 1 s_opt1 module id 3 2 sensor id 5 0 4 module1 module4 module3 module2 module6 module5 v ddio s ensor id connection methods f or cob s _opt2 gnd c 6 1nf n c gnd gndvddio gnd nc r 7 680 n c nc s _opt1 nc gnd i nt_a 0 1 s ensor id i nt 3 2 5 4 module2 module1 module id module5 module4 module3 module6 i nt_a o pt2 connection methods for cob.the 300k resistor connected to opt2 should be placed on the main board, in case the opt2 node is left floating when it is not connected to the touch panel. sensor_opt1 and sensor_opt2 are sensor id pins. six dif f erent kinds of connection method can distinguish among 6 module manuf acturers. sensor id numbers 0-5 indicate 6 module manuf acturers respectiv ely . sensor_opt2 cannot be lef t f loating. i nterf ace sequence (f or ref erence only ) unused sens or drv pins can be lef t f loating. for channel selection, please ref er to tool tttttbfheerat1rarmwrogtt module main board opt2 connection methods for cof. pay attention to sensor id list on the right. opt2 pins cannot be left floating. s ens_key 4 s ens_key 3 s ens_key 1 k ey 1 1 2 s ens_key 2 k ey 2 1 2 k ey 3 1 2 u 1 GT911 s ens8 6 s ens9 7 s ens10 8 s ens11 9 s ens12 10 s ens13 11 a vdd28 12 a vdd18 13 d vdd12 14 d gnd 15 i nt 16 s ensor_opt1 17 s ensor_opt2 18 i 2c_sda 19 i 2c_scl 20 v ddio 21 r stb 2 2 d rv0 48 d rv1 47 d rv2 46 d rv3 45 d rv4 44 d rv5 43 d rv6 42 d rv7 41 d rv8 40 d rv9 39 d rv10 38 d rv11 37 d rv12 36 d rv13 35 d rv14 34 d rv15 33 d rv16 32 d rv17 31 d rv18 30 d rv19 29 d rv20 28 d rv21 27 e p 53 a gnd 49 s ens0 50 s ens1 51 s ens2 52 s ens3 1 s ens4 2 s ens5 3 s ens6 4 s ens7 5 d rv22 26 d rv23 25 d rv24 24 d rv25 23 k ey 4 1 2 d rv_key k ey design rules: 1.support at most f our touch key s.select a maximum of 4 sensing channels as sens_key and select one separate driv ing channel as drv_key . 2.the sensing channels used by key s must be shared with the touch pannel. 3. for drv_key selection, please ref er to tool tttttbfheerat1rarmwrogtt qfn6x6-52l-0.4p r 1 10k v ddio if there are pull-up resistors on the host i2c bus, these two pull-up resistors on the module should be remov ed. the v oltage vddio sets the logic lev el. when vddio is connected to avdd directly , the logic lev el is avdd, otherwise, logic lev el is 1.8v. to enable "gesture wake-up" f unction, this circuit should be connected to int pin. a vdd c 1 2.2uf c 4 2.2uf v ddio c 3 2.2uf d vdd12 c 5 10nf c 2 2.2uf j 3 host interf ace 1 2 3 4 5 6 d rv0drv0 d rv1 d rv3 d rv2 d rv5 d rv4 d rv6 d rv7 d rv9 d rv8 d rv10 d rv11 d rv12 d rv20 d rv16 d rv18 d rv19 d rv21 d rv13 d rv14 d rv15 d rv17 s ens7 s ens5 s ens4 s ens3 s ens1 s ens6 s ens0 s ens2 a vdd j ump1 2 1 3 / rst v ddio r 5 2k r 4 2k / rst i 2c_scl i 2c_sda i nt i 2c_scl i 2c_sda o pt2 v ddio g t911 sample schematic note: 9 this schematic only represents basic application. adjustments may be required to fit in with a ctual situations and application environments. e it is recommended that the capacitor be ceramic x7r.
g t911: 5-point capacitive touch controller for small-sized mid 1 9 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. 1 0. electrical characteristics 10.1 absolute maximum ratings (ambient temperature: 25 ) parameter min. max. unit analog power avdd28 (please refer to agnd) 2 .66 3 .47 v v ddio (please refer to dgnd) 1 .7 3 .47 v voltage acceptable to digital i/o -0.3 3.47 v voltage acceptable to analog i/o -0.3 3.47 v range of operating temperature -40 85 range of storage temperature -60 125 w elding temperature (10s) 3 00 esd protection voltage (hb model) 2 kv 10.2 recommended operating conditions p arameter m in. t yp. m ax. u nit a vdd28 2 .8 - 3 .3 v vddio 1.8 - 3.3 v w orking temperature - 20 2 5 8 5 1 0.3 ac electrical characteristics (ambient temperature:25 , avdd=2.8v, vddio=1.8v) parameter min. typ. max. unit osc oscillation frequency 5 9 6 0 6 1 m hz i/o output rise time, low to high - 1 4 - n s i/o output fall time, high to low - 14 - ns
g t911: 5-point capacitive touch controller for small-sized mid 2 0 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. 10.4 dc electrical characteristics (ambient temperature:25 , avdd=2.8v, vddio=1.8v or vddio=avdd) p arameter m in. t yp. m ax. u nit n ormal mode operating current - 8 1 4.5 m a g reen mode operating current - 3 .3 - m a sleep mode operating current 70 - 120 ua doze mode operating current - 0.78 - ma digital input low voltage/vil -0.3 - 0.25*vddio v digital input high voltage/vih 0.75*vddio - vddio+0.3 v digital output low voltage/vol - - 0.15*vddio v d igital output high voltage/voh 0 .85*vddio - - v
g t911: 5-point capacitive touch controller for small-sized mid 2 1 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. 1 1. package s ymbol dimensions in millimeters min. normal max. a 0 .70 0 .75 0 .80 a 1 0 .00 0 .035 0 .05 b 0.40bsc d 6.00bsc d1 4.40 4.50 4.60 e 6. 00bsc e1 4.40 4.50 4.60 e 0.15 0.20 0.25 l 0.30 0.40 0.50 l1 0.31 0.36 0.41 l2 0.13 0.18 0.23 k 0.203bsc
g t911: 5-point capacitive touch controller for small-sized mid 2 2 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. 1 2. revision history r evision d ate d escription rev. 00 2 012-11-02 preliminary version rev. 01 2012-11-22 modified configurations updated sample schematic r ev. 02 2012-12-26 modified storage temperature, supply currents in various modes and some descriptions r ev.03 2 013-03-19 a dded descriptions on filter rev.04 2013-05-14 added reflow conditions rev.05 2013-06-19 updated product features added sensor design specifications of sito updated register map modified operating modes switch diagram modified description on sleep mode and wakeup timing deleted reflow conditions updated sample schematic modified the typ. value of normal mode operating current r ev.06 2 013-08-27 a dded layout of rx channels updated i2c timing updated power-on timing updated register map updated absolute maximum ratings rev.07 2014-07-09 m odified product features modified pin definition added touch key design specifications updated power-on timing added reset timing updated i2c addressing timing deleted register map modified operating modes diagram modified sample schematic updated dc electrical characteristics r ev.08 2014-08-22 u pdated power-on and reset timings r ev.09 2 015-03-11 modified i2c addressing timing modified sample schematic updated ac electrical characteristics modified the unit of dc electrical characteristics modified package parameters
g t911: 5-point capacitive touch controller for small-sized mid 2 3 g oodix confidential reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of goodix. 1 3. contact information shenzhen huiding technology co., ltd. floor 13, phase b, tengfei industrial building, futian free trade zone shenzhen 518000 tel+86-755-33338828 fax+86-755-33338828 www.goodix.com

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