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BQ4802LYPW Datasheet(PDF) 5 Page - Texas Instruments |
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BQ4802LYPW Datasheet(HTML) 5 Page - Texas Instruments |
5 / 26 page bq4802Y bq4802LY SLUS464C – AUGUST 2000 – REVISED JUNE 2002 www.ti.com 5 PIN ASSIGNMENTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VOUT X1 X2 WDO INT RST A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS VCC WE CEIN CEOUT BC WDI OE CS VSS DQ7 DQ6 DQ5 DQ4 DQ3 DW OR PW PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VOUT NC NC WDO INT RST A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS VCC WE CEIN CEOUT NC WDI OE CS NC DQ7 DQ6 DQ5 DQ4 DQ3 DSH PACKAGE (TOP VIEW) NC – No internal connection Terminal Functions TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION A0 10 A0 – A3 allow access to the 16 bytes of real-time clock and control registers. A1 9 yg A2 8 A3 7 BC 24(1) BC should be connected to a 3-V backup cell. A voltage within the VBC range on the BC pin should be present upon power up to provide proper oscillator start-up. Not accessible in module packages. CEIN 26 Input to the chip-enable gating circuit CEOUT 25 CEOUT goes low only when CEIN is low and VCC is above the power fail threshold. If CEIN is low, and power fail occurs, CEOUT stays low for 100 µs or until CEIN goes high, whichever occurs first. CS 21 I Chip-select input DQ0 11 I DQ0–DQ7 provide x8 data for real-time clock information. These pins connect to the memory data bus. DQ1 12 I Q Q y DQ2 13 I DQ3 15 I DQ4 16 I DQ5 17 I DQ6 18 I DQ7 19 I INT 5 INT goes low when a power fail, periodic, or alarm condition occurs. INT is an open-drain output. OE 22 OE provides the read control for the RTC memory locations. RST 6 RST goes low whenever VCC falls below the power fail threshold. RST remains low for 200 ms (typical) after VCC crosses the threshold on power-up. The bq4802Y/bq4802LY also enters the reset cycle when RST is released from being pulled low for more than 1 µs. VCC 28 I 5-V or 3.3-V input VOUT 1 O VOUT provides the higher of VCC or VBC, switched internally, to supply external RAM. V 14 Ground VSS 20(1) (1) This pin should be left unconnected (NC) when using the SNAPHAT (DSH) package. |
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