User's Manual

M50 Hardware Design
M50_HD_V2.0 - 38 -
3.5. Charge interface
M50 provides charging function for rechargeable Li-Ion or Lithium Polymer battery. It is
introduced simply in this document. If customer wants to get more information about charging,
please refer to the document [13].
Table 8: Pin definition of the charging
Name Pin I/O Description.
GATDRV 74 O Charge driving
CHGLDO 73 I Charger power supply source
CHGDET 72 I Charger detection
ISENSE 71 I Current sense
BATSN S 70 I VBAT voltage sense
3.6. Power saving
Upon system requirement, there are several actions to drive the module to enter low current
consumption status. For example, “AT+CFUN” can be used to set module into minimum
functionality mode and DTR hardware interface signal can be used to lead system to SLEEP
mode.
3.6.1. Minimum functionality mode
Minimum functionality mode reduces the functionality of the module to a minimum level, thus
minimize the current consumption when the slow clocking mode is activated at the same time.
This mode is set with the “AT+CFUN” command which provides the choice of the functionality
levels <fun>=0, 1, 4.
 0: minimum functionality
 1: full functionality (default)
 4: disable both transmitting and receiving of RF part
If the module is set to minimum functionality by “AT+CFUN=0”, the RF function and SIM card
function would be disabled. In this case, the UART port is still accessible, but all AT commands
correlative with RF function or SIM card function will be not accessible.
If the module has been set by “AT+CFUN=4”, the RF function will be disabled, the UART port is
still active. In this case, all AT commands correlative with RF function will be not accessible.
After the module is set by “AT+CFUN=0” or “AT+CFUN=4”, it can return to full functionality by
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