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11
A/D CONVERTER
11-2
32185/32186 Group Hardware Manual
Rev.1.10 REJ09B0235-0110 May 15, 07
11.1 Outline of A/D Converter
The 32185/32186 contains 10-bit resolution A/D Converter of the successive approximation type. The A/D
converter has 16 analog input pins (channels) AD0IN0–AD0IN15. In addition to performing conversion
individually on each channel, the A/D Converter can perform conversion successively on all of N channels
(N = 1–16) as a single group. The conversion result can be read out in either 10 or 8 bits.
There are following conversion and operation modes for the A/D conversion:
(1) Conversion Modes
A/D conversion mode
: Ordinary mode in which analog input voltages are converted into digital quantities.
Comparator mode (Note 1): A mode in which analog input voltage is compared with a preset comparison
voltage to find only the relative magnitude of two quantities. (Useful in only
single operation mode)
(2) Operation Modes
Single mode
: Analog input voltage on one channel is A/D converted once or
comparated (Note 1) with a given quantity.
Scan mode
: Analog input voltages on two or more selected channels (in N channel
units, N = 1–16) are sequentially A/D converted.
Single-shot scan mode
: Scan operation is performed for one cycle.
Continuous scan mode
: Scan operation is repeated until stopped.
(3) Special Operation Modes
Forcible single mode execution during scan mode
: Conversion is forcibly executed in single mode (com
parator mode) during scan operation.
Scan mode start after single mode execution : Scan operation is started subsequently after executing
conversion in single mode.
Conversion restart
: A/D conversion being executed in single or scan mode
is restarted.
(4) Sample-and-Hold Function
The analog input voltage is sampled when starting A/D conversion, and A/D conversion is performed on
the sampled voltage. This function can be enabled or disabled as necessary.
(5) Simultaneous Sampling Function
Optional two channels are sampled at the same time, and 2-channel continuous A/D conversion is carried
out for the sampled voltage.
(6) A/D Disconnection Detection Assist Function
To suppress influences of the analog input voltage leakage from any preceding channel during scan mode
operation, a function is incorporated that helps to fix the electric charge on the chopper amp capacitor to
the given state (AVCC0 or GND) before starting A/D conversion. This function provides a sure and reliable
means of detecting a disconnection in the wiring patterns connecting to the analog input pins.
11.1 Outline of A/D Converter