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AIC1761-CS14 Datasheet(PDF) 8 Page - Analog Devices |
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AIC1761-CS14 Datasheet(HTML) 8 Page - Analog Devices |
8 / 15 page AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 8 MODE PIN The MODE pin determines the mode in which the IC works: MODE Pin Mode Function Floating NORMAL Normal operation VDD TEST 1/512 safety timer GND AC −∆V detector reset, timer stops (not reset) The AIC1761/1766 will operate normally when the MODE pin is left floating ( a 0.1 µF 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 VDD or to GND: (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 VDD) An unique feature of the AIC1761/1766 is that it can be put into a TEST mode by pulling the MODE pin to VDD, allowing verification tests for 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: 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 approximately 2.8V to 3.3V, 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. |
Similar Part No. - AIC1761-CS14 |
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Similar Description - AIC1761-CS14 |
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