Voltage Monitoring State Machine - Sierra Wireless MC5725 Hardware Integration Manual

CDMA and GSM / UMTS Mini Card Hardware Integration Guide
Figure 2-2: Voltage monitoring state machine
Normal
20
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
For instructions on using the commands, refer to AT Command
Set for User Equipment (UE) (Release 6) (+CFUN=0 command),
CDMA CnS Reference (Document 2130754)
(CNS_RADIO_POWER [0x1075] command), or MC87XX
Modem CnS Reference (Document 2130602) (Disable Modem
command).

Voltage monitoring state machine

The module has a state machine to monitor the VCC3.3
(3.0 V‐3.6 V) supply (Figure 2‐2).
current_vcc > VOLT_LO_NORM
current_vcc < VOLT_LO_WARN
current_vcc > VOLT_LO_NORM
current_vcc > VOLT_HI_CRIT
current_vcc < VOLT_HI_NORM
Table 2-1: Voltage trigger levels
Condition
VOLT_HI_CRIT
VOLT_HI_NORM
VOLT_LO_NORM
VOLT_LO_WARN
VOLT_LO_CRIT
Proprietary and Confidential
Low Supply Voltage
Critical
(Low power mode)
current_vcc
< VOLT_LO_CRIT
Low Supply Voltage
Warning
High Supply Voltage
Critical
(Low power mode)
Voltage (V)
MC57xx MC8775/75V
MC8780/81
3.6 3.6
3.5 3.5
3.1 3.1
3.0 3.0
2.9 2.9
Host asserts
W_Disable#
Power off.
Handled by
Power State
state machine.
Host asserts
W_Disable#
MC8785V
MC8790/90V
MC8791V/92V
3.6
3.5
3.1
3.05
3.00
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