TMP110 datasheet(13/44 Pages) TI

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Table 7-3. 12-Bit Q4 Encoding Parameters (continued)

PARAMETER

VALUE

Resolution

0.0625

Range (+)

127.9375

Range (–)

-128

25˚C

0x0190

Table 7-4. 12-Bit Q4 Bit Values in °C

Sign

0.5

0.25

0.125 0.0625

-128

1/2

1/4

1/8

1/16

-27

2-1

2-2

2-3

2-4

/* 12-bit format will have 4 bits discarded by right shift

q4 is 0.062500 resolution

the following bytes represent 24.5C */

uint8_t byte1 = 0x18;

uint8_t byte2 = 0x80;

float f = (((int8_t) byte1 << 8 | byte2) >> 4) * 0.0625f;

int mC = (((int8_t) byte1 << 8 | byte2) >> 4) * 1000 >> 4;

int C = (int8_t) byte1;

7.3.3 Temperature Limits and Alert

The TMP113 has an alert feature and uses the TLow_Limit register for low threshold comparison and

THigh_Limit register for high threshold comparison. The alert limit is programmed in the TMP113 in a 12-bit

two's complement format based in the Configuration register, with a resolution of 62.5m°C. At the end of each

temperature conversion, the temperature result is compared with the high limit and low limit registers, and the

alert status flag and ALERT pin are updated.

The alert status flag in the configuration register and the ALERT pin are updated after every temperature

conversion based on the Alert_Mode and Polarity bit settings in the configuration register.

As shown in Figure 7-1, in comparator mode (Alert_Mode = 0b), the ALERT pin and status flag become active

when the temperature equals or exceeds the value in THigh_Limit for Fault number of consecutive conversions.

The ALERT pin and status flag remain active until the temperature falls below the TLow_Limit for the same

number of consecutive conversions.

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TMP113

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