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STM86312
1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER
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MANY DISPLAY MODES (11 SEGMENTS & 11 DIGITS TO 16 SEGMENTS & 4 DIGITS) KEY SCANNING (6 x 4 MATRIX) DIMMING CIRCUIT (EIGHT STEPS) HIGH-VOLTAGE OUTPUT (VDD - 35V MAX) LED PORTS (4 CHS, 20mA MAX) GENERAL PURPOSE INPUT PORT (4 bits) NO EXTERNAL RESISTOR NECESSARY FOR DRIVER OUTPUT (P-CH OPEN DRAIN + PULL DOWN RESISTOR OUTPUT) SERIAL INTERFACE (CLK, STB, DIN, DOUT)
PQFP44
DESCRIPTION The STM86312 is a VFD (Vacuum Fluorescent Display) controller/driver that is driven on a 1/4 to 1/11-duty factor. It consists of 11-segments output lines, 6 grid output lines, 5 segments/grid output drive lines, a display memory, a control circuit, and a key scan circuit. Serial data are input to the STM86312 through a three-line serial interface. ORDERING CODES
Type STM86312 Temperature Range -40 to 85 C Package PQFP44
This VFD controller/driver is ideal as a peripheral device for a single-chip microcomputer.
Comments 250 parts per Reel
May 2004
Rev. 1
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Figure 1: Block Diagram
Figure 2: Pin Configuration (TOP VIEW)
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Table 1: Pin Description
PlN N 1, 2, 3, 4 5 6 8 9 SYMBOL SW1, SW2, SW3, SW4 DOUT DIN CLK STB KEY1, KEY2, KEY3, KEY4 VDD SEG1/KS1 to SEG6/KS6 SEG7 to SEG11 NAME AND FUNCTION General-purpose switch inputs. Output serial data at falling edge of the shift clock, starting from lower bit. This is N-ch open-drain output pin. Input serial data at rising edge of the shift clock, starting from lower bit. Reads serial data at rising edge, and outputs data at falling edge. Initializes serial interface at rising or falling edge to make STM86312 waiting for reception of command. Data input after STB has fallen are processed as a command. While command data are processed, current processing is stopped, and the serial interface is initialized. While STB is high, CLK is ignored. Input data to these pins are latched at end of the display cycle. 5V 10%. Segment output pins (Dual function as key source). Segment output pins.
10, 11, 12, 13 14, 38 15, 16, 17, 18, 19, 20 21, 22, 23, 24, 25 26, 28, 29, 30, 31 32, 33, 34, 35, 36, 37 39, 40, 41, 42 7, 43 27 44
SEG12/GRID11 to These pins are selectable for segment or grid driving. SEG16/GRID7 Grid output pins. GRID1 to GRID6 LED1 to LED4 VSS VEE OSC CMOS outputs. +20 mA max. Connect this pin to system GND. Pull-down level. VDD - 35V max. Connect to an external resistor.
Table 2: Absolute Maximum Ratings (TA = 25C, VSS = 0V)
Symbol VDD VEE VI VO2 IO1 IO2 TA Logic Supply Voltage Driver Supply Voltage Logic Input Voltage VFD Driver Output Voltage LED Driver Output Current VFD Driver Output Current Operating Ambient Temperature Parameter Value -0.5 to 7 VDD+0.5 to VDD-40 -0.5 to VDD+0.5 VEE-0.5 to VDD+0.5 25 -40 (Grid) -15 (Segment) -40 to 85 Unit V V V V mA mA C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
Table 3: Thermal Data
Symbol RTj-c Parameter Thermal Resistance Junction-Case Value 56 Unit C/W
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Table 4: Recommended Operating Conditions
Symbol VDD VIH VIL VEE Logic Supply Voltage High Level Input Voltage Low Level Input Voltage Driver Supply Voltage Parameter Min 4.5 0.7xVDD 0 0 TYP 5 Max 5.5 VDD 0.3xVDD VDD-35 Unit V V V V
Maximum power consumption PMAX = VFD driver dissipation + RL dissipation + LED driver dissipation + dynamic power consumption. Where segment current = 3 mA, grid current = 15 mA, and LED current = 20 mA, VFD driver dissipation = number of segments x 6 + number of grids/(number of grids + 1) x 30 (mW) RL dissipation = (VDD - VEE)2/50 x (segment + 1) (mW) LED driver dissipation = number of LEDs x 20 (mW) Dynamic power consumption = VDD x 5 (mW) Example Where VEE = -25 V, VDD = 5 V, and in 16-segment and 6-digit modes, VFD driver dissipation = 16 x 6 + 6/7 x 30 = 122 RL dissipation = 302/50 x 17 = 306 LED driver dissipation = 4 x 20 = 80 Dynamic power consumption = 5 x 5 = 25 Total 553 mW. Table 5: Electrical Characteristics (VDD = 4.5 to 5.5V, VSS = 0V, VEE = VDD - 35V, TA = -20 to 70C, unless otherwise noted. Typical values are at TA = 25C)
Value Symbol VOH1 VOL1 VOL2 IOH21 IOH22 IOLEAK RL II VIH VIL VHYS IDDdyn Parameter High Level Output Voltage Low Level Output Voltage Low Level Output Voltage High Level Output Current High Level Output Current Driver Leakage Current Output Pull-Down Resistor Input Current High Level Input Voltage Low Level Input Voltage Hysteresis Voltage Dynamic Current Consumption CLK, DIN, STB Under no load, display off 0.35 5 Test Conditions Min. LED1-LED4, IOH1=-1mA LED1-LED4, IOL1=20mA DOUT, IOL2 = 4mA VO = VDD - 2V, Seg1 to Seg11 VO = VDD - 2V, Grid1 to Grid6, Seg12/Grid11 to Seg16/Grid7 VO = VDD - 35V, driver off Driver Output VI = VDD or VSS 0.7VDD 0.3VDD -3 -15 -10 50 100 150 1 0.9VDD 1 0.4 Typ. Max. V V V mA mA A k A V V V mA Unit
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Table 6: Switching Characteristics (VDD = 4.5 to 5.5V, VSS = 0V, VEE = VDD - 35V, TA = -20 to 70C, unless otherwise noted. Typical values are at TA = 25C)
Value Symbol tPLZ tPZL tTZH1 tTZH2 tTHZ fMAX CI Fall Time Maximum Clock Frequency Input Capacitance Rise Time Parameter Propagation Delay Test Conditions Min. CLK DOUT RL = 10 k, CL = 15 pF CL = 300 pF Seg1 to Seg11 Grid1 to Grid6, Seg12/ Grid11 to Seg16/Grid7 CL = 300 pF, Segn, Gridn Duty = 50% 1 15 Typ. Max. 300 100 2 0.5 120 s MHz pF s ns Unit
Table 7: Timing Characteristics (VDD = 4.5 to 5.5V, TA = -20 to 70C, unless otherwise noted. Typical values are at TA = 25C)
Value Symbol PWCLK PWSTB tSETUP tHOLD tWAIT Parameter Clock Pulse Width Strobe Pulse Width Data Setup Time Data Hold Time CLK STB CLK CLK Wait Time (Note 1) Test Conditions Min. 400 1 100 100 1 1 Typ. Max. ns s ns ns s s Unit
tCLK-STB Clock-Strobe Time
NOTE 1: Refer to page Serial Communication Format.
DISPLAY RAM ADDRESS AND DISPLAY MODE The display RAM stores the data transmitted from an external device to the STM86312 through the serial interface; addresses are as follows, in 8-bits unit:
Seg1 00 HL 02 HL 04 HL 06 HL 08 HL 0A HL 0C HL 0E HL 10 HL 12 HL 14 HL b0 XX HL Seg4 00 HU 02 HU 04 HU 06 HU 08 HU 0A HU 0C HU 0E HU 10 HU 12 HU 14 HU b3 b4 XX HU Seg8 01 HL 03 HL 05 HL 07 HL 09 HL 0B HL 0D HL 0F HL 11 HL 13 HL 15 HL b7 Seg12 01 HU 03 HU 05 HU 07 HU 09 HU 0B HU 0D HU 0F HU 11 HU 13 HU 15 HU Seg16 DIG1 DIG2 DIG3 DIG4 DIG5 DIG6 DIG7 DIG8 DIG9 DIG10 DIG11
"0" in memory means VEE on output; "1" in memory means VDD on output.
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Figure 3: Key Matrix And Key-input Data Storage Ram The key matrix is of 6 x 4 configuration, as shown below
The data of each key are stored as illustrated below, and are read by the appropriate read command, starting from the least significant bit
KEY1 Seg1/KS1 Seg3/KS3 Seg5/KS5 b0 b3 b4 KEY4 KEY1 Seg2/KS2 Seg4KS4 Seg6/KS6 b7 KEY4
LED PORT Data are written to the LED port by a write command, starting from the least significant bit of the port. When a bit of this port is 0, the corresponding LED lights; when the bit is 1, the LED goes off. The data of bits 5 through 8 are ignored.
MSB b3 b2 b1 LSB b0
LED1 LED2 LED3 LED4 Don't Care
On power application, all the LEDs remain dark.
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SW DATA The SW data are read by the appropriate read command, starting from the least significant bit. Bits 5 through 8 of the SW data are 0.
MSB 0 0 0 0 b3 b2 b1 LSB b0
SW1 SW2 SW3 SW4
COMMANDS A command sets the display mode and status of the VFD driver. The first 1 byte input to the STM86312 through the DIN pin after the STB pin has fallen is regarded as a command. If STB is set high while commands/data are transmitted, serial communication is initialized, and the commands/data being transmitted are invalid (however, the commands/data already transmitted remain valid). (1) DISPLAY MODE SETTING COMMAND This command initializes the STM86312 and selects the number of segments and number of grids (1/4 to 1/11 duty, 11 segments to 16 segments). When this command is executed, display is forcibly turned off, and key scanning is also stopped. To resume display, the display ON command must be executed. If the same mode is selected, however, nothing is performed.
MSB 0 0 b2 b1 LSB b0 DISPLAY MODE SETTING 000 : 4 digits, 16 segments 001 : 5 digits, 16 segments 010 : 6 digits, 16 segments 011 : 7 digits, 15 segments 100 : 8 digits, 14 segments 101 : 9 digits, 13 segments 110 : 10 digits, 12 segments 111 : 11 digits, 11 segments Don't Care
On power application, the 11-digit 11-segment mode is selected.
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(2) DATA SETTING COMMAND This command sets data write and data read modes.
MSB 0 1 0 b2 b1 LSB b0 DATA WRITE AND READ MODE SETTING 00 : Write data to display memory 01 : Write data to LED port 10 : Read key data 11 : Read SW data ADDRESS INCREMENT MODE SETTING (DISPLAY MEMORY) 0= Increments address after data has been written 1= Fixed address Don't Care
On power application, the normal operation mode and address increment mode are set. Do not use STM86312 in test mode. (3) ADDRESS SETTING COMMAND This command sets an address of the display memory
MSB 1 1 b4 b3 b2 b1 LSB b0
Address (00H-15H) Don't Care
If address 16H or higher is set, the data are ignored, until a correct address is set. On power application, the address is set to 00H. (4) DISPLAY CONTROL COMMAND
MSB 1 0 b3 b2 b1 LSB b0 DISPLAY MODE SETTING 000 : Set Pulse Width to 1/16 001 : Set Pulse Width to 2/16 010 : Set Pulse Width to 4/16 011 : Set Pulse Width to 10/16 100 : Set Pulse Width to 11/16 101 : Set Pulse Width to 12/16 110 : Set Pulse Width to 13/16 111 : Set Pulse Width to 14/16 TURNS ON/OFF DISPLAY 0= Display OFF (Key Scan Continues *) 1= Display ON Don't Care
On power application, the 1/16-pulse width is set and the display is turned off.
*: On power application, key scanning is stopped.
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Figure 4: Key Scanning And Display Timing
* The value can be modified by trimmering ROSC.
One cycle of key scanning consists of one frame, and data of 6 x 4 matrices are stored in RAM. SERIAL COMMUNICATION FORMAT Figure 5: Reception (command/data write)
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Figure 6: Transmission (data read)
Because the DOUT pin is an N-ch open-drain output pin, be sure to connect an external pull-up resistor to this pin (1 k to 10 k).
*: When data are read, a wait time tWAIT of 1s is necessary within the rising edge of the eighth clock that has set the command and the falling one of the first clock that has read the data.
Figure 7: Switching Characteristics Waveform
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APPLICATION Figure 8: Updating display memory by incrementing address
Command 1: sets display mode Command 2: sets data Command 3: sets address Data 1 to n: transfers display data (22 bytes max.) Command 4: controls display Figure 9: Updating specific address
Command 1: sets data Command 2: sets address Data: display data
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Figure 10: Application Circuit
Note: ROSC = 47k for oscillator resistor R1=1~10 k for external pull-high resistor R2~R5 = 750~1.2 k R6~R9 = 10k for external pull-low resistor D1~D6 = 1N4001 Ef = Filament voltage for VFD.
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PQFP44 MECHANICAL DATA
mm. DIM. MIN. A A1 A2 b c D D1 D3 E E1 E3 e L L1 K 0 0.73 1.80 0.29 0.11 13.2 10.00 8.00 13.2 10.00 8.00 0.80 0.88 1.6 3.5 7 0 1.03 0.029 2.00 TYP MAX. 2.45 0.25 2.20 0.45 0.23 0.071 0.011 0.004 0.520 0.394 0.315 0.520 0.394 0.315 0.031 0.035 0.063 3.5 7 0.041 0.079 MIN. TYP. MAX. 0.096 0.010 0.087 0.018 0.009 inch
0076922/D
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Tape & Reel PQFP44 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 12.25 12.25 2.1 3.9 15.9 12.8 20.2 60 30.4 12.45 12.45 2.3 4.1 16.1 0482 0482 0.083 0.153 0.626 TYP MAX. 330 13.2 0.504 0.795 2.362 1.196 0.490 0.490 0.091 0.161 0.639 MIN. TYP. MAX. 12.992 0.519 inch
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Table 8: Revision History
Date 27-May-2004 Revision 1 First Release Description of Changes
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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners (c) 2004 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. http://www.st.com
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