BL0938 multi-rate control ic 28pinplccpackage feature low pow er: asy n chronous static chip design m e thod, support sto p , wa it pow er-save m ode. 8-bit tim er, with 7-bit pre-position. d ouble cry s tal vibration circuit inside chip. 4mh z , used as tim er of local sy stem bus. 32.768k h z , used as tim er at the real tim e. two way s ,8 i/o port in each (high-im pedance as power-on, input m ode). each port has program m a ble pull-on resistor. current in i/o port can drive standard ttl. h a rdw a re w a tchdog including. 8 interrupt sources: tim er, softw a re, outside, rtc, u a r t, low voltage, key board, w a tchdog. o n e u a r t serial com m unication port. program m a ble real tim er rtc, one or ten seconds interrupt can be produce. standard 5v w o rking voltage. supply rtc by 3.3v backup battery as pow er dow n. k i nds of reset function: low voltage, electrify , reset pin, w a tchdog. BL0938 a pplication system frame 220v n l b l 0932 b l 0955 power meter ic c ount er b l 0938 b l 5606 2 phase and 4 step electrical m o to r d r iv er infrared module eep rom bl24c02 gathering meter-record module summariz a tion BL0938 is a kind of 8-bit m i cro-contro l unit, w h ich is high-perform ance and low - pow er, specially for pow er m e ter circuit. it is m a de with cmos process, including 4k by te user ro m and 196k by te user ra m. it has m a ny m e rits, such as low-power, high- integrated level, high reliability and etc. it also has high-stability real-tim e clock and hardware watchdog inside the chip. a serial port is included to m eet the needs of infrared and gathering m e ter-record com m unication. while apply i ng to infrared m ode, a 38k m odulated w a ve is produced inside the chip. serial port rx d and txd can be used to com m unicate with wire-carried wave in low voltage sy stem , or m a ke up gathering m e ter-record sy stem by 485 port. 16 i/o ports can give users support of m u lti-path data processing function, or be used as general i/o ports. the ability of resisting electrom a gnetic interference and radiation is pow erful: esd 4000v ; fast pulse group 4000v . BL0938 and bl2220r3, a 8-bit m i cro controller of belling, are com p atible in com m a nd sy stem . BL0938 is m o stly used in m u lti-function power m e ter (including m u lti-rate, advance pay m ent and gathering m e ter-record sy stem ) and other plug-in civil or industrial control sy stem . figure 1 o multi-rate power meter sy stem address o no.810, yishan road shanghai china tel o 86-021-64850700 fax o 86-64852222 zip.200233 .com .com .com 4 .com u datasheet
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