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AC75 Hardware Interface Description
Strictly confidential / Preliminary
Please note that the reference voltages listed in Table 26 are the values measured directly
on the AC75 module. They do not apply to the accessories connected.
Table 26: Signal description
Function
Signal name
Power
BATT+
supply
Power
GND
supply
Charge
VCHARGE
Interface
BATT_TEMP
ISENSE
VSENSE
CHARGEGATE
External
VEXT
supply
voltage
AC75_HD_V00.202
IO Signal form and level
I
V
max = 4.5V
I
V
typ = 3.8V
I
V
min = 3.3V during Tx burst on board
I
I ≈ 2A, during Tx burst
n Tx = n x 577µs peak current every
4.616ms
Ground
I
V
min = 1.015 * V
I
BATT+
V
max = 5.45V
I
I
Connect NTC with R
NTC
ground. See Section 3.5.3 for B value of
NTC.
I
V
max = 4.65V
I
ΔV
max to V
= +0.3V at normal
I
BATT+
condition
I
V
max = 4.5V
I
O
V
max = 5.5V
O
I
max = 0.6mA
O
O
Normal mode:
V
min = 2.75V
O
V
typ = 2.93V
O
V
max = 3.05V
O
I
max = -50mA
O
Page 87 of 120
Comment
Five pins of BATT+ and GND
must be connected in parallel
for supply purposes because
higher peak currents may
occur.
Minimum voltage must not fall
below 3.3V including drop,
ripple, spikes.
Application Ground
This line signalizes to the
processor that the charger is
connected.
If unused keep pin open.
Battery temperature
≈ 10kΩ @ 25°C to
measurement via NTC
resistance.
NTC should be installed
inside or near battery pack to
enable proper charging and
deliver temperature values.
If unused keep pin open.
ISENSE is required for
measuring the charge current.
For this purpose, a shunt
resistor for current
measurement needs to be
connected between ISENSE
and VSENSE.
If unused connect pin to
VSENSE.
VSENSE must be directly
connected to BATT+ at
battery connector or external
power supply.
Control line to the gate of
charge FET
If unused keep pin open.
VEXT may be used for
application circuits, for
example to supply power for
an I2C
If unused keep pin open.
Not available in Power-down
mode. The external digital
logic must not cause any
spikes or glitches on voltage
VEXT.
s
27.04.2006
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