User's Manual

Smart Machine Smart Decision
SIM5320_Hardware Design_V1.01 2011-11-10
40
MODULE
CURRENT_SINK
Pin 45 is +5V tolerant-
suitable for driving white
LEDs
Current Controls
Passive
device
+
-
VBAT
High
current
Figure 29: Current drive
Note: The sinking current can be adjusted to meet design requirement through the AT command “AT+ CLEDITST =<0>,
<value>”.The “value” ranges from 0 to 15,on behalf of the current changes from 0mA to 150mA in steps of 10mA.
3.10.2 Reset Function
SIM5320AD also have a RESET pin (PIN4) to reset the module. This function is used as an emergency
reset only when AT command “AT+CPOF” and the POWER_ON pin has no effect. User can pull the
RESET pin to ground, then the module will reset.
This pin is already pulled up in module, so the external pull-up resistor is not necessary. A 100nF capacitor
close to the RESET pin is strongly recommended. A reference circuit is recommended in the following
figure.
Figure 30: Reset circuit
Note
： 50ms<t<200ms. ESD components are suggested to be used on Reset pin.
3.10.3 ADC
SIM5320AD has a dedicated ADC that is available for digitizing analog signals such as battery voltage