TCN75AVOA datasheet(16/40 Pages) MICROCHIP

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TCN75A

DS21935D-page 16

 2010 Microchip Technology Inc.

5.3.1

AMBIENT TEMPERATURE

The TCN75A has a 16-bit read-only Ambient

Temperature register that contains 9-bit to 12-bit

temperature data. (0.5°C to 0.0625°C resolutions,

respectively). This data is formatted in two’s

complement. The bit assignments, as well as the

corresponding resolution, is shown in the register

assignment below.

The refresh rate of this register depends on the

selected ADC resolution. It takes 30 ms (typical) for

9-bit data and 240 ms (typical) for 12-bit data. Since

this register is double-buffered, the user can read the

conversion in the background. The decimal code to

ambient

temperature

conversion

shown

Equation 5-2:

EQUATION 5-2:

Code

–



Where:

TA = Ambient Temperature (°C)

Code = TCN75A output in decimal

AMBIENT TEMPERATURE REGISTER (TA) — ADDRESS <0000 0000>b

Upper Half:

R-0

Sign

26 °C

25 °C

24 °C

23 °C

22 °C

21 °C

20 °C

bit 15

bit 8

Lower Half:

R-0

2-1 °C/bit

2-2 °C

2-3 °C

2-4 °C

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

Note 1:

When the 0.5°C, 0.25°C or 0.125°C resolutions are selected, bit 6, bit 7 or bit 8 will remain clear <0>,

respectively.

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