Siemens TC65 Specifications download pdf (Page 89)

TC65 Hardware Interface Description

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TC65_HD_V02.000 Page 89 of 120 08.06.2006

Function Signal name IO Signal form and level Comment

Power

indicator

PWR_IND O V

IH

max = 10V

V

OL

max = 0.4V at Imax = 2mA

PWR_IND (Power Indicator)

notifies the module’s on/off

state.

PWR_IND is an open

collector that needs to be

connected to an external pull-

up resistor. Low state of the

open collector indicates that

the module is on. Vice versa,

high level notifies the Power-

down mode.

Therefore, the pin may be

used to enable external

voltage regulators which

supply an external logic for

communication with the

module, e.g. level converters.

Ignition IGT I

Internal pull-up: R

I

 30kΩ, C

I

 10nF

V

IL

max = 0.8V at Imax = -150µA

V

OH

max = 4.5V (V

BATT+

)

ON

~~~

|____|

~~~

Active Low ≥ 400ms

This signal switches the

mobile on.

This line must be driven low

by an open drain or open

collector driver.

Emergency

reset

I

Internal pull-up: R

I

 5kΩ

V

IL

max = 0.2V at Imax = -0.5mA

V

OH

min = 1.75V

V

OH

max = 3.05V

Signal

~~~

|______|

~~~

Pull down ≥ 10ms

Reset or turn-off in case of

emergency: Pull down and

release EMERG_RST. Then,

activating IGT for 400ms will

reset TC65. If IGT is not

activated for 400ms, TC65

switches off.

Data stored in the volatile

memory will be lost. For

orderly software controlled

reset rather use the

AT+CFUN command (e.g.

AT+CFUN=x,1).

This line must be driven by

open drain or open collector.

If unused keep pin open.

Power-on

reset

EMERG_RST

O

Internal pull-up: R

I

 5kΩ

V

OL

max = 0.2V at I = 2mA

V

OH

min = 1.75V

V

OH

max = 3.05V

Reset signal driven by the module:

VEXT

EMRG_RST

appr. 120ms

(see also Figure 5 and Figure 6)

Reset signal driven by the

module which can be used to

reset any application or

device connected to the

module. Only effective for

120ms during the assertion of

IGT when the module is

about to start.

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