Datasheet

18 Atmel AT30TS00 [Preliminary]
8585B−SEEPR−8/10
6.6. Critical Alarm Trip Register (16-bit Read/Write, Address = 04h)
The Critical Alarm Trip Register holds the user programmed Critical Alarm temperature boundary trip point in
11-bit two’s complement format (0.25°C resolution) that can be used to monitor ambient temperature (See
Table 6-11 and Table 6-12). When the temperature increases above this trip point, the
EVENT
pin will be asserted
(if enabled). It will remain asserted until temperature decreases below or equal to the trip point minus any
hysteresis set. This register becomes read only if the Critical Alarm Trip Lock Bit (CRTALML) bit seven in the
configuration register is set to a ‘1’.
Table 6-11. Critical Alarm Trip Register Bit Distribution
Bit 15 14 13 12 11 10 9 8
Symbol RFU SIGN CRITEVT
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 CRITEVT 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 6-12. Critical 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 CRITEVT Critical Alarm Trip temperature bits
Represented in two’s complement format
1:0 RFU Reserved for future use. Read as ‘0’