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TLC32040MJ Datasheet(PDF) 9 Page - Texas Instruments |
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TLC32040MJ Datasheet(HTML) 9 Page - Texas Instruments |
9 / 30 page TLC32040M ANALOG INTERFACE CIRCUIT POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 4–9 power-up sequence To ensure proper operation of the AIC and as a safeguard against latch-up, it is recommended that a Schottky diode with a forward voltage less than or equal to 0.4 V be connected from VCC– to ANLG GND (see Figure 16). In the absence of such a diode, power should be applied in the following sequence: ANLG GND and DGTL GND, VCC–, then VCC+ and VDD. Also, no input signal should be applied until after power up. AIC responses to improper conditions The AIC has provisions for responding to improper conditions. These improper conditions and the response of the AIC to these conditions are presented in Table 1 below. AIC register constraints The following constraints are placed on the contents of the AIC registers: 1. TA register must be ≥ 4 in WORD mode (WORD/BYTE = high). 2. TA register must be ≥ 5 in BYTE mode (WORD/BYTE = low). 3. TA’ register can be either positive, negative, or zero. 4. RA register must be ≥ 4 in WORD mode (WORD/BYTE = high). 5. RA register must be ≥ 5 in BYTE mode (WORD/BYTE = low). 6. RA’ register can be either positive, negative, or zero. 7. (TA register ± TA’ register) must be > 1. 8. (RA register ± RA’ register) must be > 1. 9. TB register must be > 1. Table 1. AIC Responses to Improper Conditions IMPROPER CONDITION AIC RESPONSE TA register + TA’ register = 0 or 1 TA register – TA’ register = 0 or 1 Reprogram TX Counter A with TA register value TA register + TA’ register < 0 MODULO 64 arithmetic is used to ensure that a positive value is loaded into the TX Counter A, i.e., TA register + TA’ register + 40 HEX is loaded into TX Counter A. RA register + RA’ register = 0 or 1 RA register – RA’ register = 0 or 1 Reprogram RX Counter A with RA register value RA register + RA’ register = 0 or 1 MODULO 64 arithmetic is used to ensure that a positive value is loaded into the RX Counter A, i.e., RA register + RA’ register + 40 HEX is loaded into RX Counter A. TA register = 0 or 1 RA register = 0 or 1 AIC is shutdown. TA register < 4 in WORD mode TA register < 5 in BYTE mode RA register < 4 in WORD mode RA register < 5 in BYTE mode The AIC serial port no longer operates. TB register = 0 or 1 Reprogram TB register with 24 HEX RB register = 0 or 1 Reprogram TB register with 24 HEX AIC and DSP cannot communicate Hold last DAC output |
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