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XT65/XT75 Hardware Interface Overview
6.5 Pin Assignment and Signal Description
Please note that the reference voltages listed in
module. They do not apply to the accessories connected.
Table 17: Signal description
Function
Signal name
Power
BATT+
supply
Power
GND
supply
Charge
VCHARGE
Interface
BATT_TEMP
ISENSE
VSENSE
CHARGEGATE
External
VEXT
supply
voltage
XT65_XT75_HO_v00.130
Confidential / Preliminary
Table 17
IO
Signal form and level
I
V
= 3.3V to 4.5V
I
V
typ = 3.8V
I
I
≈
2A, during Tx burst
n Tx = n x 577µs peak current every
4.616ms
Ground
I
V
min = 3.1 V
I
V
max = 5.25V
I
I
Connect NTC with R
25°C to ground.
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
I
I
max = 0.6mA (for fast charging)
I
O
Normal mode:
V
min = 2.75V
O
V
typ = 2.93V
O
V
max = 3.05V
O
I
max = -50mA
O
C
= 1µF
load,max,extern
Page 34 of 67
are the values measured directly on the XT65/XT75
Comment
Five pins of BATT+ and GND must
be connected in parallel for supply
purposes because higher peak
currents may occur.
Application Ground
This line signalizes to the proces-
sor that the charger is connected.
If unused keep pin open.
≈
10kΩ @
Battery temperature measurement
NTC
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.
Connect ISENSE directly at the
shunt for current measurement.
If unused connect pin to VSENSE.
VSENSE must be directly con-
nected to BATT+ at battery con-
nector 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 I
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
2
C.
2006-10-12
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