Multi-Functional Interface; Reset Function - SimCom SIM5215 Hardware Design

Table 31: Timing parameters
Parameter Description
T(sync) PCM_SYNC cycle time
T(synch) PCM_SYNC high time
T(syncl) PCM_SYNC low time
T(clk) PCM_CLK cycle time
T(clkh) PCM_CLK high time
T(clkl) PCM_CLK low time
PCM_SYNC setup time high before falling edge of
T(susync)
PCM_CLK
PCM_SYNC hold time after falling edge of
T(hsync)
PCM_CLK
PCM_DIN setup time before falling edge of
T(sudin)
PCM_CLK
PCM_DIN hold time after falling edge of
T(hdin)
PCM_CLK
T(pdout) Delay from PCM_CLK rising to PCM_DOUT valid
Delay from PCM_CLK falling to PCM_DOUT
T(zdout)
HIGH-Z
Note: SIM5215&SIM5216 can transmit PCM data by USB except for PCM interface. Please refer to document [22] for
more information of PCM Application Note.

3.12 Multi-functional interface

SIM5215&SIM5216 merges functions for various applications. It can enrich users' design and lower the
cost of users' hardware.

3.12.1 Reset Function

SIM5215&SIM5216 also have a RESET pin (PIN29) 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.
SIM5215&SIM5216_Hardware Design_V2.02
Smart Machine Smart Decision
Min
–
400
–
–
–
–
60
60
50
10
–
–
50
Typ Max Unit
125 – μs
500 – ns
124.5 – μs
488 – ns
244 – ns
244 – ns
– – ns
– – ns
– – ns
– – ns
– 350 ns
160 – ns
2012-08-31