Temperature Monitoring; Figure 29. Temperature Monitoring State Machine; Table 66. Temperature Monitoring States - Sierra Wireless AirPrime AR7558 Hardware Integration Manual

Hardware Integration Guide

6.18. Temperature Monitoring

The AirPrime AR7558 has internal temperature monitoring of both the PMIC device and the Power
Amplifier devices.
current_temp < TEMP_HI_WARN
current_temp > TEMP_HI_WARN
Normal
current_temp < TEMP_HI_NORM
Figure 29. Temperature Monitoring State Machine
Table 66. Temperature Monitoring States
State Description
Both PMIC and PA
Normal Thermistors are
between
High Either PMIC or PA
Temperature Thermistor has
Warning exceeded
High Either PMIC or PA
Temperature Thermistor has
Critical exceeded
Low Either PMIC or PA
Temperature Thermistor has
Critical descended past
1 There are two sets of thresholds: PATEMP for PA Thermistor, and PCTEMP for PMIC Thermistor.
To restore full operation, temperature readings for both the PA and PMIC Thermistors must be within
the Normal or High Temperature Warning state thresholds.
4116922
High Temperature
Critical
(Low power mode)
current_temp > TEMP_HI_CRIT
High Temperature
Warning
Low Temperature
Critical
(Low power mode)
1
Threshold
TEMP_HI_NORM
TEMP_LO_NORM
TEMP_HI_WARN
TEMP_HI_CRIT
TEMP_HI_CRIT
Rev 1.1
Baseband Specification
Application asserts ON/OFF
Issues AT!POWERDOWN
state machine.
Application asserts ON/OFF
Issues AT!POWERDOWN
Default Temp
Functionality
value (° C)
+85
All
-40
All –
+95
Warning message output
on AT Command port
Low Power Mode – Device
140 will only make Emergency
calls
Low Power Mode – Device
-45 will only make Emergency
calls
January 21, 2015
Or
Power off.
Handled by
Power State
Or
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