Power Interface; Power Ramp-Up; Power-Up Timing; Figure 6-1: Voltage / Temperature Monitoring State Machines - Sierra Wireless AirPrime MC7710 Product Technical Specification & Customer Design Manuallines

1. Module-reported temperatures at the printed circuit board.
2. Supply voltage — 3.3V
current_vcc < VOLT_LO_WARN
current_temp > TEMP_HI_WARN
Normal mode
current_vcc > VOLT_LO_NORM
current_temp < TEMP_HI_NORM
current_vcc > VOLT_LO_NORM
current_temp <= TEMP_HI_NORM
current_vcc > VOLT_HI_CRIT
current_temp < TEMP_LO_CRIT
current_vcc < VOLT_HI_NORM
current_temp > TEMP_NORM_LO
Rev 6 Mar.13 Proprietary and Confidential - Contents subject to change
Low supply voltage warning
High temperature warning
current_vcc < VOLT_LO_CRIT
current_temp > TEMP_HI_CRIT
Handled by Power
State state machine.

Figure 6-1: Voltage / temperature monitoring state machines

Power interface

Power ramp-up

On inital power up, inrush current depends on the power supply rise time — turn
on time >100 µs is required for < 3A inrush current.
The supply voltage must remain within specified tolerances while this is occurring.

Power-up timing

The unit is ready to enumerate with a USB host within a maximum of 3–5
seconds after power-up.
sequence.
3.3V
W_Disable#
USB D+

Figure 6-2: Power-up timing diagram

Normal mode
or
Low power mode
Figure 6-2 on page 53
Startup time
(Manual transition)
Handled by Power
Host asserts
W_Disable#
State state machine.
illustrates the power-up timing
Enumeration
Power
Off mode
53