Datasheet

Two-wire Digital Temperature Sensor

8585B–SEEPR–8/10

6.5. Lower Alarm Trip Register (16-bit Read/Write, Address = 03h)

The Lower Alarm Trip Register holds the user programmed lower temperature boundary trip point in 11-bit two’s

complement format (0.25°C resolution) that can be used to monitor ambient temperature in an operating window

(See Table 6-9 and Table 6-10). When temperature decreases below this trip point minus any hysteresis set or

increases to meet or exceed this trip point, then the

EVENT

pin is asserted (if enabled).

This register becomes read only if the Alarm Window Lock bit (WINLOCK) bit six in the configuration register is

set to a ‘1’.

Table 6-9. Lower Alarm Trip Register Bit Distribution

Bit 15 14 13 12 11 10 9 8

Symbol RFU SIGN ALMWINL

Default Value 0 0 0 0 0 0 0 0

R / W access R R R R/W R/W R/W R/W R/W

Bit 7 6 5 4 3 2 1 0

Symbol ALMWINL RFU

Default Value 0 0 0 0 0 0 0 0

R / W access R/W R/W R/W R/W R/W R/W R R

Table 6-10. Lower Alarm Trip Register Bit Description

Bit Symbol Description

15:13 RFU Reserved for future use. Read as ‘0’

12 SIGN Sign bit

0 = Ambient temperature is greater than or equal to 0°C

1= Ambient temperature is less than 0°C

11:2 ALMWINL Lower Alarm Trip temperature bits

Represented in two’s complement format

1:0 RFU Reserved for future use. Read as ‘0’