ST52T400 datasheet(52/94 Pages) STMICROELECTRONICS

52 / 94 page

ST52T400/T440/E440/T441

52/94

The four modes are selected by configuring

REG_CONF1[(2)] to choose among the conver-

sion of a single channel or a sequence of chan-

nels

and

REG_CONF1[(1)]

perform

the

conversion once or continuously.

REG_CONF1[(5:3)] bits allows the user to choose

the channel to be converted in Single Channel

mode or the last channel to be converted (starting

from AC0) in Multiple Channels mode.

To start the conversion, REG_CONF16[(0)] must

be set to “1” and to “0” to stop it.

Note: in Single conversion modes, the Start bit

REG_CONF16[(0)] must be reset to 0 before

starting another conversion; in Comparator Mode

it must be set to ‘”0”.

Reset Configuration Value = “00000000”

The Analog Comparator in A/D Converter Mode

supplies an interrupt source. The interrupt signal

can be generated either after the end of the each

channel conversion (REG_CONF3[(4)]=0) or after.

the

end

the

conversion

sequence

(REG_CONF3[(4)]=1).

Reset Configuration Value = “00000000”

Table 7.1 Configuration Register 1

Bit

Name

Value

Description

REFM

Convert only data

Convert data and

reference value

CONV

Single Conversion

Continuous Conversion

SEQ

Single Channel

Multiple Channel

CHAN

000

Channel 0 AC0

001

Channel 1 AC1

010

Channel 2 AC2

011

Channel 3 AC3

100

Channel 4 AC4

101

Channel 5 AC5

110

Not used

111

Not used

NBCV

One Conversion

Two Conversion

Three Conversion

Not Used

Table 7.2 Configuration Register 15

Bit

Name

Description

7:0

PRES(7:0)

Timer Prescaler (7:0)

Table 7.3 Configuration Register 3

Bit

Name

Value

Description

0MODE

Comparator Mode

A/D Mode

1REFV

Reference= GNDA

Reference = 2.42 V

2POL

Rising crossing

Falling crossing

3UPDW

Up Counter

Down Counter

4INT

Interrupt after each

conversion

Interrupt after the end

of the conversion

cycle

CUR

000

Current generator off

001

µA charge current

010

µA charge current

011

µA charge current

100

µA charge current

101

µA charge current

110

µA charge current

111

µA charge current

Table 7.4 Configuration Register 16

Bit

Name

Value

Description

STRT

A/D Converter Stopped

A/D Converter Started

ADM

Capacitor ramp

External ramp generator

Not used

7:4

PRES(11:8

Timer Prescaler (11:8)

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