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| TB2902HQ TOSHIBA Bi-CMOS Digital Integrated Circuit Silicon Monolithic TB2902HQ Maximum Power 41 W BTL x 4-ch Audio Power IC The TB2902HQ is 4ch audio amplifier for car audio application. This IC can generate high power, high quality sound output, POUT MAX = 41 W, using a pure complementary P-ch and N-ch DMOS output stage. The built-in self diagnosis function which is included can be controlled via I2C BUS. In addition, stand-by and mute function, and various Protection feature are included. Features * High power output : POUT MAX (1) = 41 W (typ.) (VCC = 14.4 V, f = 1 kHz, JEITA max, RL = 4 ) : POUT MAX (2) = 37 W (typ.) (VCC = 13.7 V, f = 1 kHz, JEITA max, RL = 4 ) : POUT MAX (3) = 70 W (typ.) (VCC = 14.4 V, f = 1 kHz, JEITA max, RL = 2 ) : POUT (1) = 27 W (typ.) (VCC = 14.4 V, f = 1 kHz, THD = 10%, RL = 4 ) : POUT (2) = 23 W (typ.) (VCC = 13.2 V, f = 1 kHz, THD = 10%, RL = 4 ) : POUT (3) = 45 W (typ.) (VCC = 14.4 V, f = 1 kHz, THD = 10%, RL = 2 ) Low distortion ratio: THD = 0.015% (typ.) (VCC = 13.2 V, f = 1 kHz, POUT = 5 W, RL = 4 ) Low noise: VNO = 90 Vrms (typ.) (VCC = 13.2 V, Rg = 0 , BW = 20 Hz to 20 kHz, RL = 4 ) Built in stand by & muting function: controlled via I2C Bus (pin 16) Built in clipping detection (pin 4) Built in I2C Bus for stand-by, mute, voltage gain control, self diagnosis: Output short detection, offset detection, tweeter or speaker open detection (pin 22 and 25) Built-in various protection circuits (Note 1, Note 2) Thermal shut down, over-voltage, out to GND, out to VCC, out to out short circuit Operating supply voltage: VCC (opr) = 9 to 18 V (RL = 4 ) VCC (opr) = 9 to 16 V (RL = 2 ) Weight: 7.7 g (typ.) * * * * * * * Note 1: Install the product correctly. Otherwise, it may result in break down, damage and/or degradation to the product or equipment. Note 2: These protection functions are intended to avoid some output short circuits or other abnormal conditions temporarily. These protect functions do not warrant to prevent the IC from being damaged. - In case of the product would be operated with exceeded guaranteed operating ranges, these protection features may not operate and some output short circuits may result in the IC being damaged. 1 2004-08-18 TB2902HQ Block Diagram +B C2 C5 10 Ripple 1 TAB 6 VCC2 20 VCC1 9 C1 11 IN1 8 7 5 C1 12 IN2 2 3 16 C4 For Mute Out1 (+) PW-GND1 RL = 4 C3 RF Out1 (-) Out2 (+) PW-GND2 RL = 4 RR Out2 (-) Out3 (+) PW-GND3 RL = 4 Time constant 17 IN3 18 19 15 C1 LF Out3 (-) Out4 (+) PW-GND4 RL = 4 13 Pre-GND 14 C1 IN4 21 24 23 LR Out4 (-) 22 SW IC Bus 2 SCL SDA 25 4 Clip Detection Diagnosis Some of the functional blocks, circuits, or constants labels in the block diagram may have been omitted or simplified for clarity. 2 2004-08-18 TB2902HQ Caution and Application Information (description is made referring only on the single channel.) 1. Voltage Gain Adjustment This IC has no NF (negative feedback) Pins. Therefore, the voltage gain can not be adjusted (except by software). However, this feature makes possible space and cost saving. Amp. 2A Amp. 1 Input Amp. 2B Figure 1 Block Diagram The amplifier gain, GV = 26dB, is calculated using the expression below: The voltage gain of amp.1: GV1 = 0dB The voltage gain of amp.2A, B: GV2 = 20dB The voltage gain of BTL connection: GV (BTL) = 6dB Therefore, the total voltage gain is decided by expression below. GV = GV1 + GV2 + GV (BTL) = 0 + 20 + 6 = 26dB In the case when GV = 12dB selected via I2C, GV1 changed from 0dB to -14dB so that the output dynamic range is reduced as the output of Amp.1 is attenuated. 2. Muting Time Constant and Pop Noise Suppression when VCC Rapidly Falls (pin 16) The capacitor C4 at pin 16 is for muting time constant to suppress the pop noise. The larger value capacitor is used, the lower pop noise becomes but the longer the muting time from the mute ON command sent to muting an output 16 To mute circuit sound actually. The charge period, which makes the delay of muting after "Mute On" command is written, is MIN=30msec, MAX=180msec in case From low voltage of C4 (Pin 16) = 1 uF, Vcc=9 to 18V and Tj = -40 muting circuit to 150 degrees condition. As the VCC is rapidly falling, the IC internal low voltage muting operates to eliminate the large pop noise basically. If the effect of the internal low voltage muting is not enough in such a case, make this pin 16 set Figure 2 Pin 16 Muting Circuit at low: 5 V and less by external circuit for more effective to suppress the pop noise. In this case, this pin 16 has to be released from setting at low before going back to play mode. Additionally, the initial state after turning the amplifier "ON" or after turning stand by "off" by I2C Bus is muted, so that it is necessary to send a "mute off" command to change from this condition to play mode. Caution on the use of the muting function The audio muting function is enabled when pin 16 is not set Low. While the time constant of the muting function is determined by the value of C4, the designer should take into account the possible generation of pop noise during switching operations. The pop noise which is generated when the power or muting function is turned ON/OFF will vary according to the time constant set by capacitor C4 value. In the case when C4 value is large and the time constant is long, pop noise will be suppressed during the time interval when the voltage on pin 16 is falling. However, the pop noise may become apparent as a "peaky" sound if the mute ON or OFF command is sent from Controller while the voltage at pin 16 is rising. C4 1 F 3 2004-08-18 TB2902HQ 3. Clip Detection The output clip detection terminal, pin 4, has an open collector output structure on chip as shown in Figure 3. In the case when the output waveform is clipping, the clip detection circuit is operated and the NPN Tr. is turned on. It is possible to improve the audio output quality by controlling the volume and/or tone control circuits through a low pass filter (L.P.F) smoothing circuit as shown in Figure 3. The sensitivity of the circuit to clipping level can be selected T.H.D. = 1% or 10% via I2C bus. In the event that this function is not used, pin4 should be left open circuit. 4 L.P.F. smoothing circuit Volume control circuit Clip detector Tone control circuit Output AC waveform Internal detection circuit Clip Det. 5 V output GND Waveform L.P.F output Figure 3 Clip Detection 4 2004-08-18 TB2902HQ 4. External Component Values Component Recommended Name Value Effect Purpose Lower than Recommended Value Cut-off frequency becomes higher Higher than Recommended Value Cut-off frequency becomes lower Notes Pop noise is concerned with this capacitor. C1 0.22 F To eliminate DC To reduce ripple C2 10 F To determine the time of turn on diag To provide sufficient oscillation margin To reduce pop noise Ripple filter Power ON/OFF time and turn Power ON/OFF time and turn ON diag cycle shorter ON diag cycle longer C3 0.1 F Reduces noise and provides sufficient oscillation margin Pop noise becomes larger Muting ON/OFF time is shorter Power supply ripple filtering Pop noise becomes smaller Muting ON/OFF time is longer C4 C5 1 F 3900 F Note 3: In case of the recommended value not used. 5. Fast Mute Mode This feature will normally be used to suppress pop noise resulting from VCC transients during engine cranking condition. The fast mute mode can be entered on receipt of a command via I2C bus. Using the IB2 register and setting to `one' the bit D6, it is possible to generate a fast I2C mute command. If a fast mute command is received, this IC will operate and will discharge the capacitor C4 at pin16. Therefore the Pop sound will be reduced compared to the condition when Fast Mute is not used in the engine cranking condition. 5 2004-08-18 TB2902HQ 6. Explanation for Self Diagnosis Via I2C (1) Bus map Slave Address Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 0 1 1 1 0 1 1 0 0 Write Mode Read Mode D8H Details Hex WRITE * Bit7 0 1 0 0 0 0 0 0 0 0 0 0 0 1 1 0 Sub address Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Details Page Mode (auto increment) OFF Page Mode (auto increment) ON Control Byte1 Control Byte2 01H 02H Hex * Bit7 0 0 0 0 0 0 0 1 Control byte1 (01H) Bit6 0 0 0 0 0 0 1 Bit5 0 0 0 0 0 1 0 Bit4 0 0 0 0 1 0 0 Bit3 0 0 0 1 0 0 0 Bit2 0 0 1 0 0 0 0 Bit1 0 1 0 0 0 0 0 Bit0 1 0 0 0 0 0 0 Function Clip Det 1% to 10% change R-ch Muting off (play) Fch Muting off (play) R-ch Gain 26dB to 12dB Fch Gain 26dB to 12dB Offset Det Enable Diag Cycle Enable Turn-on Select (normal/repeatedly) * Bit7 0 0 0 0 0 0 1 Control byte2 (02H) Bit6 0 0 0 0 0 0 1 0 Bit5 0 0 0 0 0 1 0 Bit4 0 0 0 0 1 0 0 Bit3 0 0 0 1 0 0 0 Bit2 0 0 1 0 0 0 0 Bit1 0 1 0 0 0 0 0 Bit0 1 0 0 0 0 0 0 Function R-ch Iccq become Lower Fch Iccq become Lower Current Detection Enable Line Drive Diag Stand By OFF (play) Clip Det Pin change to Offset Det Fast mute ON/OFF Current Detection. Level change from 500 mA (max) to 300 mA (max) Note 4: Self mute circuit is included on chip and is in independent from I2C bus stage. Self mute operating voltage is VCC = 7.8 V Note 5: Auto Increment is available. If control byte 1 is chosen by sub address, it is not necessary to send byte 2 in cases when both byte 1 and 2 are to be written. Ex) In case of sub address = byte1 chosen: Sub address byte 1 byte 1 writing Sub address byte 2 byte 2 writing: available Sub address byte 1 byte 1 writing ---------------------------- byte 2 writing: available 6 2004-08-18 TB2902HQ READ Byte 1 Bit7 0 0 0 0 0 Bit6 0 0 0 0 0 Bit5 0 0 0 0 0 Bit4 0 0 0 0 1 Bit3 0 0 0 1 0 Bit2 0 0 1 0 0 Bit1 0 1 0 0 0 Bit0 1 0 0 0 0 At "Bit = 1" Condition Ch1 Short to GND Ch1 Short to VCC Ch1 Open load or Offset Detected Ch1 Short load Ch1 Diagnosis condition (bit = 1: permanent, 0: turn-on) Ch1 Current Detection (at IB2 D2 = 1 = enable only) 0 0 1 0 0 0 0 0 (IB2 - D7 = 0: bit = 1: <250 mA, 0: >500 mA) (IB2 - D7 = 1: bit = 1: <100 mA, 0: >300 mA) 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 Bit = 1: Diag. Cycle terminated, 0: Not terminated TSD Mute ON (thermal warning) Byte 2 Bit7 0 0 0 0 0 Bit6 0 0 0 0 0 Bit5 0 0 0 0 0 Bit4 0 0 0 0 1 Bit3 0 0 0 1 0 Bit2 0 0 1 0 0 Bit1 0 1 0 0 0 Bit0 1 0 0 0 0 At "Bit = 1" Condition Ch2 Short to GND Ch2 Short to VCC Ch2 Open load or Offset Detected Ch2 Short load Ch2 Diagnosis condition (bit = 1: permanent, 0: turn-on) Ch2 Current Detection (at IB2 D2 = 1 = enable only) 0 0 1 0 0 0 0 0 (IB2 - D7 = 0: bit = 1: <250 mA, 0: >500 mA) (IB2 - D7 = 1: bit = 1: <100 mA, 0: >300 mA) 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 Current sensor activated (D6 = 1) Offset detection activated (D7 = 1) Byte 3 Bit7 0 0 0 0 0 Bit6 0 0 0 0 0 Bit5 0 0 0 0 0 Bit4 0 0 0 0 1 Bit3 0 0 0 1 0 Bit2 0 0 1 0 0 Bit1 0 1 0 0 0 Bit0 1 0 0 0 0 At "Bit = 1" Condition Ch3 Short to GND Ch3 Short to VCC Ch3 Open load or Offset Detected Ch3 Short load Ch3 Diagnosis condition (bit = 1: permanent, 0: turn-on) Ch3 Current Detection (at IB2 D2 = 1 = enable only) 0 0 1 0 0 0 0 0 (IB2 - D7 = 0: bit = 1: <250 mA, 0: >500 mA) (IB2 - D7 = 1: bit = 1: <100 mA, 0: >300 mA) 1 1 Diagnotic status (= IB1 - D6 bit = 1: diag enable) Stand-by status (= IB2 - D4 bit = 1: play) 7 2004-08-18 TB2902HQ Byte 4 Bit7 0 0 0 0 0 Bit6 0 0 0 0 0 Bit5 0 0 0 0 0 Bit4 0 0 0 0 1 Bit3 0 0 0 1 0 Bit2 0 0 1 0 0 Bit1 0 1 0 0 0 Bit0 1 0 0 0 0 At "Bit = 1" Condition Ch4 Short to GND Ch4 2 Short to VCC Ch4 Open load or Offset Detected Ch4 Short load Ch4 Diagnosis condition (bit = 1: permanent, 0: turn-on) Ch4 Current Detection (at IB2 D2 = 1 = enable only) 0 0 1 0 0 0 0 0 (IB2 - D7 = 0: bit = 1: <250 mA, 0: >500 mA) (IB2 - D7 = 1: bit = 1: <100 mA, 0: >300 mA) x x Note 6: Short circuit protection can be operated channel by channel. EX) If channel 1 output is shorted, channel 1 is protected but other channels are available. Caution: sub address 0x15 (15H) is for our internal testing only. Do not apply for your using. 8 2004-08-18 TB2902HQ (2) Description for turn on diagnosis This IC can determine whether the conditions listed below occur or not at turn ON: -Short to GND -Short to VCC -Output to output short -Speaker open As first "switch on", the write data is sent to "turn ON" the IC. If the turn on diagnostic is activated at this time, the write data, with the diagnostic cycle byte: IB1 D6 set at 1, is sent at the same time The result of self diagnosis can be obtained from the read data sent after the turn on diagnostic data permitted time, as below Figure: WRITE DATA READ DATA READ DATA Pin10 ripple voltage Permanent diagnostic enable Turn On diagnostic DATA permitted time Turn On diagnostic acquisition time (80 ms typ.) Permanent diagnostic DATA permitted time FAULT event Figure 4 Diagnosis Timing Chart WRITE DATA Set the diagnostic l Pin10 ripple voltage READ DATA READ DATA WRITE DATA To become standby off (turning or power ON) Turn On diagnostic acquisition time (80 ms typ.) Turn On diagnostic between On and Off time (100 ms typ.) Figure 5 Number of Times Turn ON Diagnosis Timing Chart 9 2004-08-18 TB2902HQ As initially, the write data is set when the on diagnostic cycle enable (IB1 D6 = 1), the turn on diagnosis can be available for repeated use by sending the read command repeatedly after the initial set up as shown as Figure 5. Therefore, it is useful to check number of cycles from Power ON to the output appearance. This IC has two built-in diagnostic modes dependent on the Turn-on timing. A) Normal mode (one shot) of Turn-on diagnostics (data of IB1, D7 = 1) B) Repeatability mode of Turn-on diagnostics (data of IB1, D7 = 0) A) Normal mode (one shot diag.) For example, if you want to get two valid readings, you have to send the command to read three times. True data are second data and third data. This is trigger to enable the diag cycle. You have to read for an interval of 150 ms or more to get a valid reading. The Data just received was detected on the previous diagnostic cycle. Writing (diag cycle enable = 1) (stand by OFF = 0) I C command 2 Reading 1 Reading 2 Reading 3 Pin 10 About 100 m DB1 D6 Diag enable Fault event Latch For example Short Load, Open Load etc. When "Diag enable" goes high, "Latch" is reflected at the "Fault event". Diag cycle with Turn-ON 10 2004-08-18 TB2902HQ B) Repetition mode Maximum interval: You can select the acquisition time. Minimum interval: It is determined by the speed of microcomputer. Writing (diag cycle enable = 1) (stand by OFF = 0) I C command 2 Reading 1 Reading 3 Reading 5 Reading 6 Reading 2 Reading 4 Pin 10 About 100 ms DB1 D6 (acquisition time with only turn-ON) About 80 ms Diag enable About 80 ms Fault event Latch The turn ON diagnostic acquisition time is determined by the ripple filter capacitance C2 and the equivalent internal resistance Rr as below expression. Acquisition time = 2 x C2 x Rr = 4400 x C2 (typ.) Rr is fixed in internal circuit and it is not varied by the fluctuation of power supply VCC voltage. C2 value determines the time from power ON (standby off) to the appearance of sound signal from output and the characteristic for ripple rejection ratio, too. So, take care with the decision on C2 value. If the turn ON diagnosis is not used, in other words the diagnostic cycle defeat command is sent, the waveform of ripple terminal voltage will change but the time from turning on to the output signal appearance will not change as illustrated below in Figure 6. WRITE DATA Turn ON diagnosis enable Turn ON diagnosis defeat Pin10 ripple pin voltage Figure 6 Turn on Diagnosis Timing Chart when Turn on diagnosis not used. 11 2004-08-18 TB2902HQ (3) Description for permanent diagnosis This IC can provide permanent diagnosis under the following conditions, whether they occur before or after turning ON: -Short to GND -Short to VCC -Output to output short circuit -Output offset detection -Current detection for tweeter open This permanent diagnosis is available not only with the diagnostic cycle byte: IB1 D6 set at 1 but also when set at 0. Additionally, the signal can be obtained by entering just a read command. It is not necessary to write the data. With permanent diagnosis fault detection, the first read data after fault removal will still show a Fault. Therefore, it is necessary to obtain 3 or more readings in order to prevent a miss judgment. For example, the speaker sometimes makes a large counter electro motive force which this IC could recognize as a fault event. Additionally, this permanent diagnosis is automatically on after the turning on diagnosis operation finished therefore there is no need to send the extra command. READ DATA WRITE DATA READ DATA result faulty READ DATA result faulty READ DATA result not faulty Pin10 ripple voltage Permanent diagnostic DATA permitted time Turn On diagnostic acquisition time (80 ms typ.) Turn On diagnostic DATA permitted time FAULT event FAULT removed Figure 7 Permanent Diagnosis Timing Chart for Each Short Detection 12 2004-08-18 TB2902HQ Regarding operation of the output offset detection, The software always detects the output offset but the result is not latched internally as shown in the Figure below: READ DATA result faulty READ DATA result not faulty Correct Tvos READ DATA result not faulty WRITE DATA Correct Tvos Pin10 ripple voltage Permanent diagnostic DATA permitted time Turn On diagnostic acquisition time (80 ms typ.) Turn On diagnostic DATA permitted time FAULT event FAULT removed Figure 8 Software Output Offset Detection Timing Chart However, this detection has to be performed in real time: Time voltage offset (Tvos) between read and next read is set at Tvos = 1/the lowest signal frequency ,or more. For instance Tvos > 50 ms if the lowest output signal frequency is 20 Hz, and to obtain 2 or more readings in order not to make a misjudgment Additionaly, the threshold level is designed at +/-2 V. 13 2004-08-18 TB2902HQ The output from the terminal of pin 4 can be changed from clip detector to offset detector output by sending the write command via I2C. If the L.P.F output voltage has become a half of pull up voltage for a while, firstly the signal output volume goes down (cliping detector function). After that, it can be judged that the abnormal output offset has occurred, if the L.P.F. output voltage does not rise above half of pull up voltage. 4 L.P.F. smoothing circuit Volume control circuit Offset detector System shut down Abnormal offset occured Vth Output waveform Vth Offset detector output pin 4 Volume down Judgement Waveform L.P.F output Detection delay time Waiting time for Prevention misjudgement Figure 9 Hardware Output Offset Detection 14 2004-08-18 TB2902HQ When the current detector for Tweeter open check is used, it is neccesary to take care as below: - Need to input the pulse or signal which is the higher out of audience frequency for example f = 20 kHz - The pulse or signal input timing has to be after mute off (play mode) - At least, the read timing has to be after 1 cycle of input pulse or signal and more, the recommadation cycles are 3 cycle and more if can. - The level of input pulse or signal is more than the detection threshold level 300 mA or 500 mA. For instance, if the tweeter impedance is 20 at f = 20 kHz which is same as input signal frequency, the output minimum voltage is: Vout = 500 mA x 20 = 10 V and more. Play Mute Mute ON WRITE DATA stand by off mute on Output WRITE DATA mute off READ DATA invalidity READ DATA invalidity READ DATA invalidity READ DATA validity Effective READ DATA validity Current detector is not effective Figure 10 Tweeter Open Detection Timing Chart Finally, if DB1 D7 = 1 then the temperature of IC chip is close to the thermal shutdown point. This warning bit becomes high, about 10 degrees below the temperature at which the overtemperature protection operates. Note 7: Timing charts may have been simplified for ease of reading. Note 8: Please arrange to read all self-diagnosis functions twice or more and apply judgment in order to avoid false triggering. 15 2004-08-18 TB2902HQ (4) Multiple faults The self diagnosis shows as below tables when there are multi fault connection for the audio outputs. At Turning ON: S.GND (out+) S.GND (out+) S.GND (out-) S.VCC Out to Out.S Open L S.GND S.GND (out-) S.GND S.GND S.VCC S.Load S.Load S.VCC + S.Load Out to Out. S S.GND S.GND S.VCC + S.Load S.Load Open L S.GND + No open S.GND + No open S.VCC + S.Load + open or No open S.Load + No open Open At Permanent: S.GND (out+) S.GND (out-) S.VCC S.GND or S.VCC (Note 10) S.GND (out-) S.GND S.GND or S.VCC (Note 10) S.VCC Out to Out.S Open L S.VCC S.VCC S.Load + S.GND S.GND (Note 9) S.VCC (Note 9) N/A Normal Out to Out. S Open L S.GND S.GND (Note 9) S.GND S.GND (out+) S.GND S.GND Note 9: If the DC offset detection mode is ON, the information which the DC offset is appeared is added. Note10: The chance which they can read this exact information is only one time although in case of other diagnosis, the more times sending read command, the higher the confidence of the result. For example, a) ch1+ is connected to GND b) ch1- is connected to VCC c) They can read or get the "Short to GND" information when the uP send the Read command. d) Next, however, they can not get the "Short to GND" or "Short to VCC" information when the uP send the Read command again. Note 11: Please arrange to read all self-diagnosis functions twice or more and apply judgment in order to avoid false triggering. Explanation of I2C bus commands Below the "ADDRESS BYTE", presently the address byte is fixed at 216 dec = D8hex = 101100xbin. (5) - Address Selection is D8hexa: A7 A6 A5 A4 A3 A2 A1 A0 (R/W) Address bit Address bit Address bit Address bit Address bit Address bit Address bit Read/Write bit 1 1 0 1 1 0 0 X X: 0 = Write instruction to device; 1 = Read instruction to device 16 2004-08-18 TB2902HQ - If R/W = 0, the Up Sends Two Instruction Bytes, IB1 and IB2: IB1 Instruction Byte: Bit D7 Turn-on diag timing Normal (D7 = 1) Repeat (D7 = 0) D6 Diagnostic cycle enable (D6 = 1) Diagnostic cycle defeat (D6 = 0) D5 Offset Detection enable (D5 = 1) Offset Detection defeat (D5 = 0) D4 Front Channel Gain = 26dB (D4 = 0) Gain = 12dB (D4 = 1) D3 Rear Channel Gain = 26dB (D3 = 0) Gain = 12dB (D3 = 1) D2 Mute front channels (D2 = 0) Unmute front channels (D2 = 1) D1 Mute rear channels (D1 = 0) Unmute rear channels (D1 = 1) D0 CD 1% (D0 = 0) CD 10% (D0 = 1) IB2 Instruction Byte: Bit D7 Current Det 500 mA (max) (D7 = 0) Current Det 300 mA (max) (D7 = 1) D6 D5 Fast mute on (D6 = 1) off (D6 = 0) Pin4 Clip Detection (D5 = 0) Pin4 Offset Detection (D5 = 1) D4 Std-by on-PA not working (D4 = 0) Std-by off-PA working (D4 = 1) D3 Amplifier mode diagnostic (D3 = 0) Line driver mode diagnostic (D3 = 1) D2 Current Det. diag enabled (D2 = 1) Current Det. diag defeat (D2 = 0) D1 Front Channels Work standard mode (D1 = 0) Work Low Iccq mode (D1 = 1) D0 Rear Channels Work standard mode (D1 = 0) Work Low Iccq mode (D1 = 1) 17 2004-08-18 TB2902HQ - If R/W = 1, the Power Amplifier Sends Four Diagnostics Bytes, DB1, DB2, DB3 and DB4: DB1 Diagnostic Byte: Bit D7 D6 Thermal warning active (D7 = 1) Diag not actived or not terminated (D6 = 0) Diag terminated (D6 = 1) D5 Channel 1 current detection Output peak current < 250 mA (IB2 - D7 = 0) - open load (D5 = 1) Output peak current < 100 mA (IB2 - D7 = 1) - open load (D5 = 1) Output peak current > 500 mA (IB2 - D7 = 0) - normal load (D5 = 0) Output peak current > 300 mA (IB2 - D7 = 1) - normal load (D5 = 0) D4 Channel 1 Turn-on diagnostic (D4 = 0) Permanent diagnostic (D4 = 1) D3 Channel 1 Normal load (D3 = 0) Short load (D3 = 1) D2 Channel 1 Turn-on diag: No open load (D2 = 0) Offset diag: No output offset (D2 = 0) D1 Channel 1 No short to VCC (D1 = 0) Short to VCC (D1 = 1) D0 Channel 1 No short to GND (D0 = 0) Short to GND (D0 = 1) Open load detected (D2 = 1) Output offset detected (D2 = 1) 18 2004-08-18 TB2902HQ DB2 Diagnostic Byte: Bit D7 Offset detection not activated (D7 = 0) Offset detection activated (D7 = 1) D6 Current sensor not activated (D6 = 0) Current sensor activated (D6 = 1) D5 Channel 2 current detection Output peak current < 250 mA (IB2 - D7 = 0) - open load (D5 = 1) Output peak current < 100 mA (IB2 - D7 = 1) - open load (D5 = 1) Output peak current > 500 mA (IB2 - D7 = 0) - normal load (D5 = 0) Output peak current > 300 mA (IB2 - D7 = 1) - normal load (D5 = 0) D4 Channel 2 Turn-on diagnostic (D4 = 0) Permanent diagnostic (D4 = 1) D3 Channel 2 Normal load (D3 = 0) Short load (D3 = 1) D2 Channel 2 Turn-on diag: No open load (D2 = 0) Offset diag: No output offset (D2 = 0) D1 Channel 2 No short to VCC (D1 = 0) Short to VCC (D1 = 1) D0 Channel 2 No short to GND (D0 = 0) Short to GND (D0 = 1) Open load detected (D2 = 1) Output offset detected (D2 = 1) Note 12: DBx (D5) is effective only at the time of "Current detection enable". 19 2004-08-18 TB2902HQ DB3 Diagnostic Byte: Bit D7 D6 D5 Stand-by status (= IB2 - D4) Diagnostic status (= IB1 - D6) Channel 3 current detection Output peak current < 250 mA (IB2 - D7 = 0) - open load (D5 = 1) Output peak current < 100 mA (IB2 - D7 = 1) - open load (D5 = 1) Output peak current > 500 mA (IB2 - D7 = 0) - normal load (D5 = 0) Output peak current > 300 mA (IB2 - D7 = 1) - normal load (D5 = 0) D4 Channel 3 Turn-on diagnostic (D4 = 0) Permanent diagnostic (D4 = 1) D3 Channel 3 Normal load (D3 = 0) Short load (D3 = 1) D2 Channel 3 Turn-on diag: No open load (D2 = 0) Offset diag: No output offset (D2 = 0) D1 Channel 3 No short to VCC (D1 = 0) Short to VCC (D1 = 1) D0 Channel 3 No short to GND (D0 = 0) Short to GND (D0 = 1) Open load detected (D2 = 1) Output offset detected (D2 = 1) 20 2004-08-18 TB2902HQ DB4 Diagnostic Byte: Bit D7 D6 D5 X X Channel 4 current detection Output peak current < 250 mA (IB2 - D7 = 0) - open load (D5 = 1) Output peak current < 100 mA (IB2 - D7 = 1) - open load (D5 = 1) Output peak current > 500 mA (IB2 - D7 = 0) - normal load (D5 = 0) Output peak current > 300 mA (IB2 - D7 = 1) - normal load (D5 = 0) D4 Channel 4 Turn-on diagnostic (D4 = 0) Permanent diagnostic (D4 = 1) D3 Channel 4 Normal load (D3 = 0) Short load (D3 = 1) D2 Channel 4 Turn-on diag: No open load (D2 = 0) Offset diag: No output offset (D2 = 0) D1 Channel 4 No short to VCC (D1 = 0) Short to VCC (D1 = 1) D0 Channel 4 No short to GND (D0 = 0) Short to GND (D0 = 1) Open load detected (D2 = 1) Output offset detected (D2 = 1) Note 13: DBx (D5) is effective only at the time of "Current detection enable". 21 2004-08-18 TB2902HQ 7. Caution for use Turn on diagnosis mode |
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