Siemens ET7 Series Especificações descarregar pdf (Página 81)

DSB75 Development Support Board Rev. B1 Hardware Description

Strictly confidential / Released

DSB75_hd_v08 Page 81 of 94 29.09.2005

Parameters Condition Min. Typical Max. Unit

Differential output

voltage at full scale sine

1kHz

1.6 Vpp Audio interface 1

(balanced input)

Handset Mode

(AT^SNFS=1)

Differential input

voltage for 0dBm0

(after settling)

30 mV

Maximum differential

output voltage, no load

6.0 Vpp

Differential output

resistance

15 

Differential output load 0 

Differential input

voltage

1.6 V

Input impedance 4.0 k

Microphone supply

voltage

5.0 V

Audio interface 1

(balanced input)

General Information

Microphone supply DC

resistance

4.6 k

Output voltage 3.4 Vpp

Differential output

resistance

15 

Differential output load 16 

Input voltage 1.6 V

Input impedance 2.0 k

Microphone supply

voltage

2.5 V

Audio interface 2

(single ended input)

General Information

Microphone supply DC

resistance

2.2 k

SPI interface

Digital audio interface

SIM interface

USB interface

SD card interface

The interface lines are

connected directly to

the GSM module

See module specification [1] for details.

Ignition (Key)

Emergency Restart

(Key)

Ignition via DTR line

@COM1

= ±3V…±9V: V

>±9V:

signal

~~~

|________|

~~~~~~~~~~~~~~~

signal

~~~

|________|

~~~~~~~~~~~~~~~

|  1s |  0.5s | |  0.5s |  0.5s |

Rise time  1ms.

Low high transition of this signal switches the module on.

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