Datasheet

© 2005 Microchip Technology Inc. DS21935A-page 11
TCN75A
4.3.2 TEMPERATURE LIMIT-SET
REGISTER (T
SET
)
The TCN75A has a 16-bit read/write Temperature
Limit-Set register (T
SET
) which contains a 9-bit data in
two’s compliment format. This data represents a maxi-
mum temperature limit. If the ambient temperature
exceeds this specified limit, the TCN75A asserts an
alert output. (Refer to Section 4.3.4.3 “ALERT Output
Configuration”).
This register uses the nine Most Significant bits (MSbs)
and all other bits are don’t cares.
The power-up default value of the T
SET
register is
80°C, or <0 1010 0000> in binary.
REGISTER 4-3: TEMPERATURE LIMIT-SET REGISTER (T
SET
)
Upper Half
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
Sign 2
6
°C/bit 2
5
°C/bit 2
4
°C/bit 2
3
°C/bit 2
2
°C/bit 2
1
°C/bit 2
0
°C/bit
bit 15 bit 8
Lower Half
R/W-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0
2
-1
°C/bit 0 0 0 0 0 0 0
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