Table 4-4 Timing Characteristics Of Dai - Siemens M20 Terminal Technical Description

Siemens Information and Communication Products
t VSDI hold time after VSCLK low
94
t VSDO delay after VSCLK high
95
Table 4-4 Timing characteristics of DAI
4.3.8 SIM card interface
In general the SIM interface is specified in GSM 11.11.
Note: the M20 supports 3V SIM cards.
Signal Function
CCVCC SIM card power supply
CCRST SIM card Reset
CCIO SIM card data in/out
CCCLK SIM card clock
CCIN SIM card Inserted switch
GND Ground
Notes:
1
) All information provided on the SIM card interface complies with GSM 11.11 and 11.12.
Contacts C4, C6 and C8 are not provided by M20.
2
) When using a SIM card reader without a CCIN switch, SIM card removal must be avoided when voltage is applied to
the M20. This should be avoided by the mechanical integration of the SIM card reader in the application.
4.3.9 Power supply indicator
The power supply indicator is only used by the inbuilt MMI software. This allows the M20 MMI software to indicate the
actual base unit power supply status on the display.
Note: this functionality is not available when controlling the M20 via the AT command interface.
Signal Function
GPCS GP chip select
GPIO0 GP port pin 0
GPIO1 GP port pin 1
GPIO 1 GPIO 0
0 0
0 1
1 0
1 1
Version 8 dated 15.03.00
I/O Level
O 2.8 V
O 2.8 V
I/O 2.8 V
O 2.8 V
I 2.8 V
0 V
I/O Level Comments
O 2.8 V reserved
may be disconnected if unused
I 2.8 V Supply source indicator (by mains or battery)
if unused, connect to a 10kOhm - 100 kOhm pull-down resistor
I 2.8 V Battery load indicator (full or below warning level)
if unused, connect to a 10kOhm - 100 kOhm pull-down resistor
Description
Base unit supplied by mains, battery full (= normal state)
Base unit supplied by battery, battery full
Base unit supplied by mains, battery voltage below warning level
Base unit supplied by battery, battery voltage below warning level
7
0
Comments
1)
Contact C1
1)
Contact C2
1)
Contact C7
1)
Contact C3
must be connected to GND, if SIM card reader does not
2
provide a CCIN switch. )
1)
Contact C5
Hardware interfaces
ns
15 ns
A
24