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ES51963 Datasheet(PDF) 5 Page - Cyrustek corporation |
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ES51963 Datasheet(HTML) 5 Page - Cyrustek corporation |
5 / 20 page 2003/9/1 5 ES51963 4 1/2 DMM Operation Mode (1) Operation of ES51963 and the external microprocessor ES51963 is a microprocessor based data acquisition ADC. ES51963 performs A-to-D conversion and the microprocessor acquires the results via interface pins: SCLK, EOC and STATUS. There are two formats for data acquisition. In format 1, ES51963 raises the logic level of EOC to high during the integration phase (INT) and de-integration phase (DINT). The microprocessor can acquire the conversion result by counting the time period as EOC is high. And the microprocessor can obtain the operation status of ES51963 such as conversion rate, buzzer frequency, sign bit, etc. from pin STATUS. The value of STATUS is read in serial with clock pin, SCLK which is controlled by microprocessor. In addition to counting the time period of EOC, ES51963 provides another way, the format 2 to obtain the conversion result. In format 2 the conversion result is computed by ES51963 itself and the microprocessor can obtain the output count from pin STATUS. The decision to choose format 1 or format 2 depends on application. Format 2 is simple for general application. On the other hand, a microprocessor must set up a timer to estimate the duration of EOC in format 1. Thus the maximum count or resolution could be changed by choosing the counting frequency of the timer. For example the maximum counts of ES51963 operating in format 2 with 4 MHz operating clock is 22,000. The same resolution is obtained in format 1 with timer counting period, 2 us/count. A higher resolution, say 44,000 counts, could be achieved by speeding up the counting frequency twice. In addition to change operation format, ES51963 allow a user to change the conversion rate, buzzer frequency on the fly. Their changing methods will be described in following sections. (2) Buzzer frequency ES51963 provides buzzer output at pin BUZout. The pin BUZin (active high) is used to control whether BUZout should output buzzer wave or not. The default buzzer frequency is 2 KHz with 4 MHz operating frequency (crystal oscillator frequency at pins OSC1 and OSC2). ES51963 provides eight buzzer frequency selection options and the external micro- processor can choose one frequency that is audible by setting the values of bits, B2, B1 and B0 in the STATUS word used in communication between ES51963 and the external microprocessor. The communication protocol will be described in detail in section (6). The |
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