Datasheet

20
Atmel AT30TSE002B [DATASHEET]
8711G–SEEPR–5/12
11.5 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 twos
complement format (0.25°C resolution) that can be used to monitor ambient temperature in an operating window (See
Table 11-9 and Table 11-10). 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
one.
Table 11-9. Lower Alarm Trip Register Bit Distribution
Table 11-10. Lower Alarm Trip Register Bit Description
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
Bit Symbol Description
15:13 RFU Reserved for Future Use. Read as zero.
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 twos complement format.
0:1 RFU Reserved for Future Use. Read as zero.