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TC35i: Migration from TC35 to TC35i
P R E L I M I N A R Y
4.4
Power Supply
General
4.4.1
TC35 and TC35i need to connect the power supply to the ZIF connector (5 pins each V
and GND). Power supply has to be a single voltage source at BATT+.
Power Supply ASIC handles all the key functions for supplying power.
The following tables show an overview of main power supply points with TC35 and TC35i
Table 4-3: Power supply signals
Feature
Input voltage range:
Ignition:
Emergency shutdown:
(Watchdog)
Synchronization:
Indication of increased current
consumption during uplink
transmission burst
Power saving:
Table 4-4: Power consumption comparison
Device
Stand-by
TC35
50µA typ
TC35i
50µA typ
TC35_TC35i_MIG_01_V01.01
General
TC35
Five pins of BATT+ and GND must be
switched in parallel for supply purposes
because peaks of up to 2A may occur.
V
= 3.3V to 5.5V
I
V
= 4.2V
I,typ
I
˜ 2A, in burst
nom
V
= 2.3V
out
≈ 220k.
R
out
V
= 0.45V @ Iout = 10µA
low,max
t
≈ 100ms
low
Signal: falling edge and hold for t
Open drain/collector driver is required to
pull down this pin to power on the GSM
Engine.
ON
Via /PD (pin no. 31)
This line must be driven by an Open Drain
or Open Collector driver.
Emergency shutdown deactivates the
modules power supply.
~~~
~~~
Signal
|______|
Active Low ≥
3.5s
V
= 0.2V @ I= 0.1mA
out,low,max
V
= 2.25V @ I=-0.1mA
out,high,min
V
= 2.76V
out,high,max
Supported trough AT+CFUN
Functionality levels <fun>=0
Power consumption
Sleep
Idle
3mA typ
10mA typ
3mA typ
25mA
29.1.2003
Five pins of BATT+ and GND must be switched
in parallel for supply purposes because peaks of
up to 3A may occur.
V
= 3.3V to 4.8V
I
V
= 4.2V
I,typ
I
˜ 2A, in burst
nom
R
˜ 100kΩ, C
˜ 1nF
I
I
V
= 0.5V @ I
ILmax
max
V
= 2.3V
Openmax
t
≈ 100ms
low
Signal: falling edge and hold for t
low
~~~
~~~
|____|
Active Low ≥ 100ms
via EMERGOFF (pin no. 31)
This line must be driven by an Open Drain or
Open Collector driver.
Emergency shutdown deactivates the modules
power supply.
~~~
Signal
|______|
V
= 0.3V @ I = 0.1mA
OLmax
V
= 2.25V @ I = -0.1mA
OHmin
V
= 2.73V
OHmax
Supported trough AT+CFUN
Functionality levels <fun>=0, 5 , 6, 7 and
8
Talk mode at
EGSM900/1800
300mA/270mA
300-400mA
BATT+
TC35i
= 20µA
low
~~~
Active Low ≥ 3.2s
Talk mode (peak) at
EGSM900/1800
1.8A typ
2A typ
Page 12 of 34
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