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A/D CONVERTER
11-2
11
32192/32195/32196 Group Hardware Manual
Rev.1.10 REJ09B0123-0110 Apr.06.07
11.1 Outline of A/D Converter
The 32192/32195/32196 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 indi-
vidually 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 (compara-
tor 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
Two channels are sampled at the same time, and 2-channel continuous A/D conversion is able to be 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