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LM77CIMMX-3 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM77CIMMX-3 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 17 page 1.0 Functional Description (Continued) 1.9 POINTER REGISTER (Selects which registers will be read from or written to): P7 P6 P5 P4 P3 P2 P1 P0 00000 Register Select P0–P2: Register Select: P2 P1 P0 Register 0 0 0 Temperature (Read only) (Power-up default) 0 0 1 Configuration (Read/Write) 010 T HYST (Read/Write) 0 1 1 T_CRIT (Read/Write) 100 T LOW (Read/Write) 101 T HIGH (Read/Write) P3–P7: Must be kept zero. 1.10 TEMPERATURE REGISTER (Read Only): D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Sign Sign Sign Sign MSB Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 CRIT HIGH LOW Status Bits D0–D2: Status Bits D3–D15: Temperature Data. One LSB = 0.5˚C. Two’s complement format. 1.11 CONFIGURATION REGISTER (Read/Write): D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 Fault Queue INT Polarity T_CRIT_A Polarity INT Mode Shutdown D0: Shutdown - When set to 1 the LM77 goes to low power shutdown mode. Power up default of “0”. D1: Interrupt mode-0is Comparator Interrupt mode, 1 is Event Interrupt mode. Power up default of “0”. D2, D3: T_CRIT_A and INT Polarity-0is active low, 1 is active high. Outputs are open-drain. Power up default of “0” D4: Fault Queue - When set to 1 the Fault Queu is enabled, see Section 1.7. Power up default of “0”. D5–D7: These bits are used for production testing and must be kept zero for normal operation. 1.12 T HYST,TLOW,THIGH AND T_CRIT_A REGISTERS (Read/Write): D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Sign Sign Sign Sign MSB Bit7 Bit6 Bit5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 X X X D0–D2: Undefined D3–D15: T HYST,TLOW,THIGH or T_CRIT Trip Temperature Data. Power up default is TLOW = 10˚C, THIGH = 64˚C, T_CRIT = 80˚C, T HYST = 2˚C. T HYST is subtracted from THIGH, and T_CRIT, and added to TLOW. Avoid programming setpoints so close that their hysteresis values overlap. See Section 1.1. www.national.com 11 |
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