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LM75BIM-3 Datasheet(PDF) 11 Page - Texas Instruments |
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LM75BIM-3 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 23 page LM75B, LM75C www.ti.com SNIS153B – JULY 2009 – REVISED MARCH 2013 An inadvertent 8-bit read from a 16-bit register, with the D7 bit low, can cause the LM75 to stop in a state where the SDA line is held low as shown in Figure 11. This can prevent any further bus communication until at least 9 additional clock cycles have occurred. Alternatively, the master can issue clock cycles until SDA goes high, at which time issuing a “Stop” condition will reset the LM75. Figure 11. Inadvertent 8-Bit Read from 16-Bit Register where D7 is Zero (“0”) POINTER REGISTER (Selects which registers will be read from or written to): P7 P6 P5 P4 P3 P2 P1 P0 0 0 0 0 0 Register Select P0-P1: Register Select: P2 P1 P0 Register 0 0 0 Temperature (Read only) (Power-up default) 0 0 1 Configuration (Read/Write) 0 1 0 THYST (Read/Write) 0 1 1 TOS (Read/Write) P3–P7: Must be kept zero. TEMPERATURE REGISTER (Read Only): D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 MSB Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 LSB X X X X X X X D0–D6: Undefined. D7–D15: Temperature Data. One LSB = 0.5°C. Two's complement format. CONFIGURATION REGISTER (Read/Write): D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 Fault Queue O.S. Polarity Cmp/Int Shutdown Power up default is with all bits “0” (zero). D0: Shutdown: When set to 1 the LM75 goes to low power shutdown mode. D1: Comparator/Interrupt mode: 0 is Comparator mode, 1 is Interrupt mode. D2: O.S. Polarity: 0 is active low, 1 is active high. O.S. is an open-drain output under all conditions. D3–D4: Fault Queue: Number of faults necessary to detect before setting O.S. output to avoid false tripping due to noise. Faults are determind at the end of a conversion. See specified temperature conversion time in the Temperature-to-Digital Converter Characteristics table. D4 D3 Number of Faults 0 0 1 (Power-up default) 0 1 2 1 0 4 1 1 6 Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM75B LM75C |
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