Sierra Wireless Writing an embedded application loader Dokumentacja Pobierz pdf (Strona 55)

Power

Rev 8 Apr.14 Proprietary and Confidential - Contents subject to change 55

Figure 5-1: Voltage/temperature monitoring state machines

Power interface

Power ramp-up

On initial 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

Figure 5-2 describes the timing sequence for powering the module on and off.

Figure 5-2: Signal timing (Power-on, and USB enumeration)

Off mode

Normal mode

Low power mode

Handled by Power

State state machine.

current_vcc > VOLT_LO_NORM

current_temp <= TEMP_HI_NORM

current_vcc < VOLT_LO_CRIT

current_temp > TEMP_HI_CRIT

current_vcc > VOLT_LO_NORM

current_temp < TEMP_HI_NORM

current_vcc < VOLT_LO_WARN

current_temp > TEMP_HI_WARN

current_vcc < VOLT_HI_NORM

current_temp > TEMP_NORM_LO

current_vcc > VOLT_HI_CRIT

current_temp < TEMP_LO_CRIT

Host cuts power to VCC line

Normal mode

Low supply voltage warning

High temperature warning

OFF

Power-on

Sequence

USB_D+

(Double enumeration)

OFF

Active

DEVICE STATE

High

Low

High

VCC

Low

t_pwr_on_seq

t_USB_active

t_USB_suspend

USB_D+

(Single enumeration)

High

Low

t_pwr_on_seq

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 109 110

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Sierra Wireless Writing an embedded application loader Dokumentacja Strona 55

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