Specifications

TC35 / TC37 Hardware Interface Description
TC35_37_HD_02_V03.10 - Released Page 75 of 92 21.12.2001
6.4 Power supply ratings
Table 29: Power supply ratings
Parameter Description Conditions Min Typ Max Unit
Supply voltage Reference point on VBATT+
contact pad
Voltage must stay within the
min/max values, including
voltage drop, ripple, spikes.
3.3 4.2 5.5 V
Voltage drop during
transmit burst
Normal condition, power control
level for P
out max
400 mV
V
BATT+
Voltage ripple Normal condition, power control
level for P
out max
@ f<200kHz
@ f>200kHz
50
2
mV
Power Down mode 50 100 µA
SLEEP mode 3 3.5 mA
IDLE mode GSM 10 20 mA
Average supply
current
TALK mode GSM 300 400 mA
I
BATT+
Peak supply current
(during 577µs trans-
mission slot every
4.6ms)
Power control level for P
out max
I
max
See Table 32
and Table 33
A
Charging current Li-Ion battery pack 500 mAI
CHARGE
Trickle charging U
battery
0...3.6V 9.0 mA
6.4.1 Drop definition
Due to peak currents of I = 2 A, a GSM transmission burst may cause considerable voltage
drop. Further losses may result from the internal resistance of the external power supply
lines. As specified above, the supply voltage V
BATT+
must not fall below 3.3 V at any time,
while the voltage drop must not exceed 400 mV.
In order to minimize voltage drop during transmission bursts, use an FFC cable as short as
possible and apply a low-impedance power supply.