ADS1000A0IDBVT datasheet(9/23 Pages) TI2

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CONFIGURATION REGISTER

READING FROM THE ADS1000

WRITING TO THE ADS1000

ADS1000

SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007

A user controls the ADS1000 operating mode and

Bits 1 - 0: PGA

PGA settings via the 8-bit configuration register. The

Bits 1 and 0 control the ADS1000 gain setting; see

configuration register format is shown in Table 3. The

Table 4.

default setting is 80H.

Table 4. PGA Bits

Table 3. CONFIGURATION REGISTER

PGA1

PGA0

GAIN

0(1)

1(1)

ST/BSY

PGA1

PGA0

Bit 7: ST/BSY

The meaning of the ST/BSY bit depends on whether

(1) Default setting.

it is being written to or read from.

In single conversion mode, writing a '1' to the ST/BSY

bit causes a conversion to start, and writing a '0' has

no effect. In continuous conversion mode, the

ADS1000 ignores the value written to ST/BSY.

A user can read the output register and the contents

When read in single conversion mode, ST/BSY

of the configuration register from the ADS1000. To do

indicates whether the A/D converter is busy taking a

this, address the ADS1000 for reading, and read

conversion. If ST/BSY is read as '1', the A/D

three bytes from the device. The first two bytes are

converter is busy, and a conversion is taking place; if

the output register contents; the third byte is the

'0', no conversion is taking place, and the result of the

configuration register contents.

last conversion is available in the output register.

A user does not always have to read three bytes from

In continuous mode, ST/BSY is always read as '1'.

the ADS1000. If only the contents of the output

Bits 6 - 5: Reserved

Bits 6 and 5 must be set to zero.

Reading more than three bytes from the ADS1000

has no effect. All of the bytes beginning with the

Bit 4: SC

fourth byte will be FFh. See Figure 7 for a timing

SC controls whether the ADS1000 is in continuous

diagram of an ADS1000 read operation.

conversion or single conversion mode. When SC is

'1', the ADS1000 is in single conversion mode; when

SC is '0', the ADS1000 is in continuous conversion

A user can write new contents into the configuration

mode. The default setting is '0'.

Bits 3 - 2: Reserved

change). To do this, address the ADS1000 for writing,

and write one byte to it. This byte is written into the

Bits 3 and 2 must be set to zero.

configuration register.

Writing more than one byte to the ADS1000 has no

effect. The ADS1000 ignores any bytes sent to it after

the first one, and will only acknowledge the first byte.

See Figure 8 for a timing diagram of an ADS1000

write operation.

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