Siemens MC55 User Manual download pdf (Page 13)

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Microphone interface 1 is high impedance (~50k Ohm) and shall be used preferably if an opamp

or a CODEC is connected or additional microphone feeding is needed.

Microphone interface 2 is high impedance (~1k Ohm) and shall be used preferably if internal

microphone feeding can be used, e.g. for an internal microphone.

Both EP1 and EP2 are the same.

Jumpers

The following sections describe the jumper configuration options available on the GPRS6055ER.

For a reference that shows the location of each set of jumpers, refer to the diagram of the

GPRS6055ER at the beginning of this chapter. The default factory jumper settings are listed in

the following table:

Jumper Description Default Factory Setting

JP1 Reserved Reserved

JP2 GSM Interrupt Jumper Default Interrupt 5 and G

JP3 Reserved Reserved

JP4

Pull-up or Pull-down for DIO0-7

1-2 – Pull-up

2-3 – Pull-down (default)

No connect – Neither

JP5

Pull-up or Pull-down for DIO8-15

1-2 – Pull-up

2-3 – Pull-down (default)

No connect – Neither

JP6 Reserved Reserved

JP7

GSM Base Address Jumper (A8 –

A3, A9 is high)

Default 2E8h

JP8

GPRS6055/COM17045 Mode

1-2 – COM17045 Compatible

2-3 – GPRS6055 (default)

LED Indicators

D1 – On when the SIM card is enabled.

D2 – Reserved

D3 – Reserved

D4 – On when GSM is transmitting

Note: The GSM AT^SSYNC command serves to configure the SYNC pin of the

application interface. The pin can either be used to indicate the current

consumption in a transmit burst (default setting) or to drive a status LED

connected to the pin. See the AT^SSYNC command for details.

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Siemens MC55 User Manual Page 13

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