AIC1761-CN08 AD [Analog Devices], AIC1761-CN08 Datasheet - Page 8

• Manufacturer Part Number: AIC1761-CN08
• Description: BATTERY CHARGE CONTROLLER
• Manufacturer: AD [Analog Devices]

ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
MODE PIN
The MODE pin determines the mode in which the
IC works:
The AIC1761/1766 will operate normally when the
MODE pin is left floating ( a 0.1 F capacitor is re-
commended to be tied to MODE pin if the charge
circuit works in a noisy environment). The
AIC1761/1766 otherwise works in following ways
if the MODE pin is biased either to V
(A) AC Mode (MODE pin biased to GND)
In the midst of normal charge operation, where
VBT pin voltage is in the range from 0.8V to 3.5V
and the preset safety timer has not run out, the
safety timer will stop if the MODE pin is somehow
pulled down to GND level. As long as the MODE
pin remains low, the VOUT pin stays ON and
LED pin OFF regardless whether the battery pack
voltage declines (- V present) or not.
The AC mode can be activated by pulling MODE
pin to GND to avoid premature battery charge
cutoff due to fluctuating charge current source.
Switching MODE pin after the end of the safety
timer has no effect on the AIC1761/1766 display
outputs, i.e., VOUT pin stays OFF while LED pin
stays ON.
(B) TEST Mode (MODE pin biased to V
An unique feature of the AIC1761/1766 is that it
can be put into a TEST mode by pulling the
MODE pin to V
the AIC1761/1766 charge circuit to be performed
in a few tens of seconds, extremely valuable in fi-
nal phase of production.
When the AIC1761/1766 is in TEST mode, all the
internal timers are reduced by the following fac-
tors when compared to normal operation:
MODE
Pin
Floating
V
GND
DD
NORMAL
TEST
AC
Mode
DD
, allowing verification tests for
Function
Normal operation
1/512 safety timer
timer stops (not reset)
V
detector
DD
or to GND:
DD
)
reset,
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1. Safety timer reduced by 512 times.
2. Initial timer reduced by 512 times.
3. Peak timer reduced by 64 times.
One critical requirement needs to be observed for
- V detector of the AIC1761/1766 to work prop-
erly in TEST mode. That is, VBT pin voltage must
be kept between
rather than 0.8V to 3.5V in NORMAL mode.
If the TEST mode function is to be utilized in pro-
duction test, it has to be well planned and includ-
ed in circuit design phase to make the voltages of
VBT pin and MODE pin externally controllable. In
addition, an externally controllable TIMER pin can
further reduce test time required for testing the
AIC1761/1766 in TEST mode.
Fig. 3 shows the timing diagram for externally
controlled VBT, TIMER, and MODE pin voltages
of a recommended AIC1766 charge circuit pro-
duction test scheme, utilizing TEST mode func-
tion. Output waveforms of VOUT and LED pins
(and FLASH pin for 14 pin version) of a properly
functioning AIC1766 are also shown in the figure.
In timer segments 4, 8 and 10, VOUT pin should
change from ON to OFF, LED pin from OFF to
ON, and FLASH pin from ON to flashing output
(approximately 4 Hz). For the reset of time,
VOUT pin should remain ON, LED pin OFF, and
FLASH pin ON.
BATTERY CHARGE CONTROLLER
approximately 2.8V to 3.3V,
AIC1761/1766
SPEC NO: DS-1761-02
8