Sd/Mmc Interface - SIM Tech SIMCom SIM5360 Hardware Design

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reporting, then "RI" will change to low logic level to inform the master (client PC). It will stay low until
the master clears the interrupt event with AT command.
Figure 19: RI behaviour in NULL Modem
If Full Modem is used to establish communication between devices, the pin "RI" is another operation
status. Initially it keeps high, when a voice call or CSD call comes, the pin "RI" will change to low for
about 5900ms, then it will return to high level for 100ms. It will repeat this procedure until this call is
answered or hung up.
Figure 20: RI behaviour in FULL Modem
To comply with RS-232 protocol, the RS-232 level shifter chip should be used to connect SIM5360 to the
RS-232-C interface. In this connection, the TTL level and RS-232 level are converted mutually. SIMCom
recommends that user uses the SP3238ECA chip with a full modem. For more information please refers to
the RS-232 chip datasheet.
Note: SIM5360 supports the communication rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200,
230400, 460800, 921600, 3200000, 3686400, 4000000bps. Default rate is 115200bps.
3.4

SD/MMC Interface

SIM5360 provides one 4-bit SD/MMC interface. Its operation voltage is 2.85V, with clock rates up to 52
MHz.It supports 1-bit SD/MMC or 4-bit SD data transmission mode. Though the same hardware
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SIM5360_Hardware Design_V1.01 2013-11-22