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Migration from MC35 to MC35i
P R E L I M I N A R Y
4.4
Power supply
General
4.4.1
MC35 and MC35i 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+ .
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 6: Power supply signals
Feature
Ignition (/IGT):
This line must be driven low by
an Open Drain or Open Collector
driver
Synchronization (SYNC):
Indication of increased current
consumption during uplink
transmission burst
Power saving:
Emergency shut down: *)
(Pin 31 – Signal name "/PD" at
MC35 and "/EMERGOFF" at
MC35i, see note below.)
*) 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 7: Current consumption comparison
Device
Talk mode
Talk mode
(during TX burst)
MC35
< 3,5A
MC35i
<3,5A
Migration from MC35 to MC35i
MC35
R
= 200kW.
pullup
V
= 0.45V @ I
= 10µA
low,max
out
t
» 100ms
low
Signal: falling edge and hold for t
V
= 0.2V @ I = 0.1mA
OLmax
V
= 2.25V @ I = -0.1mA
OHmin
V
= 2.76V
OHmax
Supported trough AT+CFUN
Functionality levels <fun>=0, 5 or 6
V
= 0.45V @ I = 0.1mA
in,low,max
Watchdog output:
V
= 0.35V @ 0.01mA
out,low
V
= 2.30V @ -0.01mA
out,high
f
= 0.16Hz
out, min
f
= 1.53Hz
out, max
Current consumption (typical)
IDLE mode
(average)
300mA
15mA
300mA
25mA
13 of 30
General
R
~ 100kW, C
pullup
V
= 0.5V @ I
low,max
t
» 100ms
low
Signal: falling edge and hold for t
low
ON ~~~|____|~~~ Active Low ³ 100ms
V
= 0.3V at I = 0.1mA
OLmax
V
= 2.25V at I = -0.1mA
OHmin
V
= 2.73V
OHmax
Supported trough AT+CFUN
Functionality levels <fun>=0, 5, 6, 7 and 8
V
= 0.45V @ I = -0.1mA
in,low,max
R
≈22kW
I
V
= 2.25V
Open,max
Watchdog output:
V
= 0.35V @ 0.01mA
out,low
V
= 2.25V @ -0.01mA
out,high
f
= 0.16Hz
out, min
f
= 1.55Hz
out, max
~~~|____|~~~ Active Low ³ 3.2s
IDLE GPRS
DATA GPRS
mode
mode
15mA
360mA
25mA
360mA
BATT+
MC35i
~ 1nF
I
= 20µA
out
low
SLEEP mode
Power
(depending on
Down
network
mode
configuration)
3mA
100mA
3mA
50µA
12.03.03
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