Specifications

TC35 / TC37 Hardware Interface Description
TC35_37_HD_02_V03.10 - Released Page 51 of 92 21.12.2001
3.9 Pin assignment
Please note that the reference voltages listed below are the values measured directly on the
TC35 or TC37 module. They do not apply to the accessories connected.
Table 18: Pin assignment
Function Signal
Name
Pin
No.
I/O Signal Level Comment
1
2
3
4
VBATT+
5
I/(O) Input:
V
in
= 3.3V...5.5V
I
max
≤ 2.0A at a return loss better than
≥ 6dB (see Figure 41 and Figure 42)
I
max
is valid only during uplink transmis-
sion timeslot (e.g. TALK mode: I
max
for
577µs every 4.616ms)
Output: only valid when charging
6
7
8
9
Power
supply
GND
10
- Ground (0V)
Usage is mandatory
Five power supply
pins have to be con-
nected in parallel due
to peak current up to
2A
Voltage must stay
within the min/max
values, including volt-
age drop, ripple,
spikes. See also
Table 29.
11Charger POWER
12
I V
in
= 5.5V...8V transformer plug
V
in
= 5.5V...8V regulated plug
I
max
= 550mA
internal Pull Down (100k")
If unused keep pin
open
Supply
voltage for
external
application
VDD 13 O IDLE / TALK mode:
V
out
= 2.9V ±3% @ 70mA, V
Batt
= 4.2V
and T
amb typ
= 25°C
V
out
= 2.9V ±3% @ 20mA, V
Batt
= 4.8V
and T
amb typ
= 25°C
I
max
= 70mA
Power Down mode: V
out
= 0V
C
load
max,extern = 1µF
Can be used, for
example, to connect a
level converter or a
pull-up resistor. Not
recommended for
components operated
by pulse current.
If unused keep pin
open.
Voltage is applied
60ms – 100ms after
IGT was driven low.
Battery
tempera-
ture
AKKU_
TEMP
14 I/O External NTC: R
NTC
= 10k" @ 25°C
B = 3370 Kelvin ±3% connected to GND
IDLE/ TALK mode:
V
out,MEAS
(R
NTC
=10k")=1.15V
Power Down mode:
V
out
= 0V (internal Pull Down)
If unused keep pin
open. If used: external
NTC should be in-
stalled inside or near
battery pack enables
the charging algorithm
and delivers tem-
perature values