Table 19: Pin Assignment And Electrical Description Of Application Interface - Siemens MC45 Manual

MC45 Hardware Interface Description
P R E L I M I N A R Y

Table 19: Pin assignment and electrical description of application interface

Function Signal name
Power BATT+
supply
GND
Charge POWER
interface
BATT_TEMP
CHARGE
External VDD
supply
voltage
VDD Low VDDLP
Power
MC45_HD_01_V00.02a
IO Signal form and level
I V = 3.3V to 4.5V
I
V norm = 4.1V
I
Inorm ≈ 2A, Imax < 3A (during Tx burst)
1 Tx, peak current 577µs every 4.616ms
2 Tx, peak current 1154µs every 4.616ms
I
V min = 3.0V
I
V max = 15V
I
I
Connect NTC with R
to ground.
O
I = -300µA ... -600µA
CHARGE
@ 3V < V < V
CHARGE
O
VDDmin = 2.84V, VDDmax = 2.96V
Imax = -10mA
C max = 1µF
L
I/O R
=1kW
I
V max ≈ 4.0V
O
V min = 2.2V, V max = 5.5V
I I
I typ = 10µA at BATT+ = 0V
I
Mobile in POWER DOWN mode:
V min = 1.2V
I
Page 62 of 90
Comments
Power supply input.
5 BATT+ pins to be
connected in parallel.
5 GND pins to be
connected in parallel.
The power supply must be
able to meet the
requirements of current
consumption in a Tx burst
(up to 3A).
Sending with two timeslots
doubles the duration of
current pulses to 1154µs
(every 4.616ms)!
This line signalizes to the
processor that the charger
is connected.
If unused keep pin open.
Input to measure the
≈ 10kW @ 25°C
NTC
battery temperature over
NTC resistor.
NTC should be installed
inside or near battery pack
to enable the charging
algorithm and deliver
temperature values.
If unused keep pin open.
This line is a current
source for the charge FET
LOAD
with a 10kW resistance
between gate and source.
If unused keep pin open.
Supply voltage, e.g. for an
external LED or level
shifter. The external digital
logic must not cause any
spikes or glitches on
voltage VDD.
Not available in POWER
DOWN mode.
VDD signalizes the "ON"
state of the module.
If unused VDD keep pin
open.
Supplies the RTC with
power via an external
capacitor or buffer battery
if no V
If unused keep pin open.
is applied.
BATT+
12.08.2002