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LM95221 Datasheet(PDF) 12 Page - National Semiconductor (TI) |
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LM95221 Datasheet(HTML) 12 Page - National Semiconductor (TI) |
12 / 16 page 2.0 LM95221 Registers (Continued) 2.1 STATUS REGISTER (Read Only Address 02h): D7 D6 D5 D4 D3 D2 D1 D0 Busy Reserved RD2M RD1M 00000 Bits Name Description 7 Busy When set to "1" the part is converting. 6-2 Reserved Reports "0" when read. 1 Remote diode 2 missing (RD2M) Remote Diode 2 is missing. (i.e. D2+ shorted to V DD, Ground or D2-, or D2+ is floating). Temperature Reading is FFE0h which converts to 255.875 ˚C if unsigned format is selected or 8000h which converts to –128.000 ˚C if signed format is selected. 0 Remote diode 1 missing (RD1M) Remote Diode 1 is missing. (i.e. D1+ shorted to V DD, Ground or D1-, or D1+ is floating). Temperature Reading is FFE0h which converts to 255.875 ˚C if unsigned format is selected or 8000h which converts to –128.000 ˚C if signed format is selected. 2.2 CONFIGURATION REGISTER (Read Address 03h /Write Address 03h): D7 D6 D5 D4 D3 D2 D1 D0 0 RUN/STOP CR1 CR0 0 R2DF R1DF 0 Bits Name Description 7 Reserved Reports "0" when read. 6 RUN/STOP Logic 1 disables the conversion and puts the part in standby mode. Conversion can be activated by writing to one-shot register. 5-4 Conversion Rate (CR1:CR0) 00: continuous mode 66ms, 15 Hz (typ) 01: converts every 200ms, 5 Hz (typ) 10: converts every 1 second, 1 Hz (typ) 11: converts every 3 seconds, 1⁄3 Hz (typ) Note: typically a remote diode conversion takes 26 ms and local conversion takes 14 ms. 3 Reserved Reports "0" when read. 2 Remote 2 Data Format (R2DF) Logic 0: unsigned Temperature format (0 ˚C to +255.875 ˚C) Logic 1: signed Temperature format (-128 ˚C to +127.875 ˚C) 1 Remote 1 Data Format (R1DF) Logic 0: unsigned Temperature format (0 ˚C to +255.875 ˚C) Logic 1: signed Temperature format (-128 ˚C to +127.875 ˚C) 0 Reserved Reports "0" when read. Power up default is with all bits “0” (zero) www.national.com 12 |
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