![SimCom SIM5215 Скачать руководство пользователя страница 50](http://html1.mh-extra.com/html/simcom/sim5215/sim5215_hardware-design_1274787050.webp)
Smart Machine Smart Decision
Table 31: Timing parameters
Parameter
Description
Min
Typ
Max
Unit
T(sync)
PCM_SYNC cycle time
–
125
–
μ
s
T(synch)
PCM_SYNC high time
400
500
–
ns
T(syncl)
PCM_SYNC low time
–
124.5 –
μ
s
T(clk)
PCM_CLK cycle time
–
488
–
ns
T(clkh)
PCM_CLK high time
–
244
–
ns
T(clkl)
PCM_CLK low time
–
244
–
ns
T(susync)
PCM_SYNC setup time high before falling edge of
PCM_CLK
60
–
–
ns
T(hsync)
PCM_SYNC hold time after falling edge of
PCM_CLK
60
–
–
ns
T(sudin)
PCM_DIN setup time before falling edge of
PCM_CLK
50
–
–
ns
T(hdin)
PCM_DIN hold time after falling edge of
PCM_CLK
10
–
–
ns
T(pdout)
Delay from PCM_CLK rising to PCM_DOUT valid
–
–
350
ns
T(zdout)
Delay from PCM_CLK falling to PCM_DOUT
HIGH-Z
–
160
–
ns
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
2012-08-31
50
Содержание SIM5215
Страница 1: ...SIM5215 SIM5216_Hardware_Design _V2 02 ...