ST10F269-Q3 datasheet(90/160 Pages) STMICROELECTRONICS

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ST10F269

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13 - A/D CONVERTER

A 10-bit A/D converter with 16 multiplexed input

channels and a sample and hold circuit is

integrated on-chip. The sample time (for loading

the capacitors) and the conversion time is

programmable and can be adjusted to the

external circuitry.

To remove high frequency components from the

analog input signal, a low-pass filter must be con-

nected at the ADC input.

Overrun error detection / protection is controlled

by the ADDAT register. Either an interrupt request

is generated when the result of a previous

conversion has not been read from the result

complete, or the next conversion is suspended

until the previous result has been read. For

applications which require less than 16 analog

input channels, the remaining channel inputs can

be used as digital input port pins. The A/D

converter

of the ST10F269 supports different

conversion modes :

– Single channel single conversion : the analog

level of the selected channel is sampled once

and converted. The result of the conversion is

stored in the ADDAT register.

– Single channel continuous conversion : the

analog level of the selected channel is repeated-

ly sampled and converted. The result of the con-

version is stored in the ADDAT register.

– Auto scan single conversion : the analog level

of the selected channels are sampled once and

converted. After each conversion the result is

stored in the ADDAT register. The data can be

transfered to the RAM by interrupt software

management or using the powerfull Peripheral

Event Controller (PEC) data transfert.

– Auto scan continuous conversion : the ana-

log level of the selected channels are repeatedly

sampled and converted. The result of the con-

version is stored in the ADDAT register. The

data can be transfered to the RAM by interrupt

software management or using the PEC data

transfert.

– Wait for ADDAT read mode : when using con-

tinuous modes, in order to avoid to overwrite

the result of the current conversion by the next

one, the ADWR bit of ADCON control register

must be activated. Then, until the ADDAT regis-

ter is read, the new result is stored in a tempo-

rary buffer and the conversion is on hold.

– Channel

injection

mode

when

using

continuous modes, a selected channel can be

converted in between

without

changing the

current operating mode. The 10-bit data of the

conversion are stored in ADRES field of

ADDAT2. The current continuous mode remains

active after the single conversion is completed.

Notes: 1. Section 21.4.5 - Direct Drive for TCL definition.

2. tCC = TCL x 24

Table 22 : ADC Sample Clock and Conversion Clock

ADCTC

Conversion Clock tCC

ADSTC

Sample Clock tSC

TCL1 = 1/2 x fXTAL

At fCPU = 40MHz

tSC =

At fCPU = 40MHz

TCL x 24

0.3

µs00

tCC

0.3

µs 2

Reserved, do not use

Reserved

tCC x 2

0.6

µs 2

TCL x 96

1.2

µs10

tCC x 4

1.2

µs 2

TCL x 48

0.6

µs11

tCC x 8

2.4

µs 2

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