address o no.810, yishan road shanghai china tel o 86-021-64850700 fax o 86-64852222 zip.200233 BL0939 pin configuration block diagram selcet reg i2c interface compare reg osc rtc period reg bl0932orbl0955 orad7755 oscin oscout ip1 ip2 led_test op_out scl sda ?? lowest power clock inside. ?? outputs four control signal. ?? four time points be set in random. ?? initialization clock and period can be displayed on the programmer. ?? i 2 c bus interface. ?? periods shifting display. ?? working according to the period set. ?? 24-hour time display. ?? time accuracy to ? 0.5 second per day. ?? operating ambient tem perature range from ? 40 to 85 ?? . ?? minimal programmable period 30 min. ?? period control accuracy to 1min. ?? output control pulse with 5v /10ma. ?? keeping voltage: 2.7v to 6.0v. ?? low supply current under 1ua when power off. data contro l general description BL0939 is an asic designed for multi-fee meter that can be applicable to electronic and mechanical meter. with special p rogrammer, it can provide multi-fee function required in the electro-energy measur e system. clock initialization and period set can be done before leaving factory or when the meter installed. it?s clock and period can be read or reset only when the meter taken down, so it?s easy to encrypt. the specially designed low - power clock circuit assures that BL0939 will run vdd ip1 ip2 reset sda scl osc1 osc2 op4 op3 op2 op1 nc l/t clk32 gnd 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 BL0939 BL0939 16pin dip .com .com .com 4 .com u datasheet
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