Specifications

Migration from MC35 to MC35i
RELEASED
MC35_MC35i_MIG_V01.03 Page 16 of 33 23.04.03
3.4 Power supply
3.4.1 General
MC35 and MC35i need to connect the power supply to the ZIF connector (5 pins each V
BATT+
and GND). Power supply has to be a single voltage source at BATT+.
The Power Supply ASIC handles all the key functions for supplying power.
The following tables show an overview of main power supply points with MC35 and MC35i.
Table 7: Power supply signals
General Feature MC35 MC35i
R
pullup
= 200kW.
V
low,max
= 0.45V @ I
out
= 10µA
R
pullup
~ 100kW, C
I
~ 1nF
V
low,max
= 0.5V @ I
out
= 20µA
Ignition (/IGT):
This line must be driven low by
an Open Drain or Open
Collector driver
t
low
» 100ms
Signal: falling edge and hold for t
low
Active Low ³ 3.2s
ON
~~~
|____|
~~~
Active Low ³ 3.2s
Power saving: Supported through AT+CFUN
Functionality levels <fun>=0, 5 or 6
Supported through AT+CFUN
Functionality levels <fun>=0, 5, 6, 7 and 8
Emergency shut down: *)
(Pin 31 – Signal name “/PD” at
MC35 and “/EMERGOFF” at
MC35i, see note below.)
V
in,low,max
= 0.45V @ I = -0.1mA
R
I
≈22kW
V
Open,max
= 2.25V
Watchdog output:
V
out,low
= 0.35V @ 0.01mA
V
out,high
= 2.25V @ -0.01mA
f
out, min
= 0.16Hz
f
out, max
= 1.55Hz
~~~
|____|
~~~
Active Low ³ 3.2s
*) Note: It is strongly recommended to use this function only in case of emergency. Therefore the signal has been renamed
from “Power Down” at the MC35 to “Emergency Shut Down” at the MC35i.
Table 8: Current consumption comparison
Current consumption (typical)
Device Talk mode
(during TX
burst)
Talk mode
(average)
IDLE mode IDLE GPRS
mode
DATA GPRS
mode
SLEEP mode
(depending on
network
configuration)
Power
Down
mode
MC35
< 2A
300mA
15mA
15mA
360mA 3mA
50mA
MC35i
<2A 300mA 25mA 25mA 360mA 3mA 50µA
3.4.2 Power up / down scenarios
MC35 and MC35i are identical regarding the power up/down scenario, but only MC35 can be
activated using the POWER lines.