ADS7830_14 Datasheet, PDF(13/27 Page) Texas Instruments – 8-Bit, 8-Channel Sampling ANALOG-TO-DIGITAL CONVERTER with I2C™ Interface

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ADS7830_14 Datasheet, PDF (13/27 Pages) Texas Instruments – 8-Bit, 8-Channel Sampling ANALOG-TO-DIGITAL CONVERTER with I2C™ Interface

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ADS7830

SBAS302C â DECEMBER 2003 â REVISED OCTOBER 2012

SDA

SCL

START

Condition

MSB

Slave Address

R/W

Direction

Bit

Acknowledgement

Signal from

Receiver

Acknowledgement

Signal from

Receiver

3-8

ACK

Repeated If More Bytes Are Transferred

STOP Condition

or Repeated

START Condition

Figure 14. Basic Operation of the ADS7830

Address Byte

MSB 6

1 LSB

A1 A0 R/W

The address byte is the first byte received following

the START condition from the master device. The

first five bits (MSBs) of the slave address are factory

pre-set to 10010. The next two bits of the address

byte are the device select bits, A1 and A0. Input pins

(A1-A0) on the ADS7830 determine these two bits of

the device address for a particular ADS7830. A

maximum of four devices with the same pre-set code

can therefore be connected on the same bus at one

time.

The A1-A0 Address Inputs can be connected to VDD

or digital ground. The device address is set by the

state of these pins upon power-up of the ADS7830.

The last bit of the address byte (R/W) defines the

operation to be performed. When set to a â1â a read

operation is selected; when set to a â0â a write

operation is selected. Following the START condition

the ADS7830 monitors the SDA bus, checking the

device type identifier being transmitted. Upon

receiving the 10010 code, the appropriate device

select bits, and the R/W bit, the slave device outputs

an acknowledge signal on the SDA line.

Command Byte

MSB 6

1 LSB

SD C2 C1 C0 PD1 PD0 X

The ADS7830 operating mode is determined by a

command byte which is illustrated above.

SD: Single-Ended/Differential Inputs

0: Differential Inputs

1: Single-Ended Inputs

C2 - C0: Channel Selections

PD1: Power-Down

0: Power-Down Selection

X: Unused

See Table 1 for a power-down selection summary.

See Table 2 for a channel selection control summary.

Table 1. Power-Down Selection

PD1

PD0

DESCRIPTION

Power Down Between A/D Converter Conversions

Internal Reference OFF and A/D Converter ON

Internal Reference ON and A/D Converter OFF

Internal Reference ON and A/D Converter ON

Product Folder Links: ADS7830

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