Micro Technic PV-1800 user manual Conversion

Users Manual & Installation Guide

PV- 1800: Power supply module with GSM MODEM

REG_ADCLO (base+0Ah): ADC command, status, and result low byte (read/write) Writing to this register starts a new A/D conversion. You should only do this when the ADC is idle.

Command bits: 0000dccc

d: 0:single-ended, 1=differential

ccc: Channel.

d	c	c	c	Conversion
0	0	0	0	AIN0 relative to AGND
0	0	0	1	AIN1 relative to AGND
0	0	1	0	AIN2 relative to AGND
0	0	1	1	AIN3 relative to AGND
0	1	0	0	AIN4 relative to AGND
0	1	0	1	AIN5 relative to AGND
0	1	1	0	AIN6 relative to AGND
0	1	1	1	AIN7 relative to AGND
1	0	0	0	Differential AIN0(+) - AIN1(-)
1	0	0	1	Differential AIN1(-) - AIN0(+)
1	0	1	0	Differential AIN2(+) - AIN3(-)
1	0	1	1	Differential AIN3(-) - AIN2(+)
1	1	0	0	Differential AIN4(+) - AIN5(-)
1	1	0	1	Differential AIN5(-) - AIN4(+)
1	1	1	0	Differential AIN6(+) - AIN7(-)
1	1	1	1	Differential AIN7(-) - AIN6(+)

Reading REG_ADCLO returns status and result bits. Result bits: rrrr00pb

p: ADC present. If 1, the ADC is available. If 0, the ADC is not mounted, and you should not write to REG_ADCLO.

b: Busy. 0 = ADC idle. The previous result can be read, and a new conversion can be started. 1 = conversion in progress. All result bits are invalid when b=1.

rrrr: Four least-significant bits of the conversion result. Only valid when b=0.

REG_ADCHI (base+0Bh): ADC result, high byte (read only)

Reading this register returns the eight most-significant bits of the conversion result. Only valid when the ADC is idle.

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