32186 datasheet(500/1032 Pages) RENESAS

500 / 1032 page

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

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