Sierra Wireless HL7748 Benutzerhandbuch
41110555
Rev 1.0
September 21, 2017
30
Product Technical Specification
Detailed Interface Specifications
VBATT
VGPIO ( pin 45 )
PWR_ON_N
Power OFF
Power ON
Power OFF
Base Band
PMU supply
Module is ‘ OFF ‘
Module is ‘ OFF ‘
Module is ‘ ON ‘
RESET
Figure 6.
PWR_ON_N and PWR_OFF Sequence
Note:
As PWR_ON_N is internally pulled up with 1M
Ω
, an open collector or open drain transistor must be
used for ignition.
VGPIO is an output from the module that can be used to check if the module is active.
•
When VGPIO = 0V, the module is OFF
•
When VGPIO = 1.8V, the module is ON (it can be in idle, communication or sleep mode)
Note:
To power the module off, use AT command
AT+CPOF
or
AT+CPWROFF
.
3.10. Reset Signal (RESET_IN_N)
To reset the module, a low-level pulse must be sent on the RESET_IN_N pad for 20ms (TBC). This
action will immediately restart the AirPrime HL77xx module with the PWR_ON_N signal at low level. (If
the PWR_ON_N signal is at high level, the module will be powered off.) As RESET_IN_N is internally
pulled up, an open collector or open drain transistor should be used to control this signal.
action will immediately restart the AirPrime HL77xx module with the PWR_ON_N signal at low level. (If
the PWR_ON_N signal is at high level, the module will be powered off.) As RESET_IN_N is internally
pulled up, an open collector or open drain transistor should be used to control this signal.
Note:
As RESET_IN_N is referenced to the VGPIO signal (1k
Ω
pull-up resistor to VGPIO 1.8V) an open
collector or open drain transistor should be used to control this signal.
Refer to the following table for the pad description of the RESET_IN_N interface.
Table 22.
RESET_IN_N Pad Description
Pad Number
Signal Name
I/O
Description
12
RESET_IN_N
I
Hardware reset the module