VDD

SDA

SCL

Microcontroller or

Microprocessor

with I C Port

2

5

14

12

13

3

4

A0

A1

CH2

CH3

CH4

SCL

9

8

7

6

GND

CH7

CH6

CH5

ADS7828-Q1

5

14

12

13

3

4

A0

A1

CH2

CH3

CH4

SCL

15

8

7

6

SDA

CH7

CH6

CH5

ADS7828-Q1

5

14

12

13

3

4

A0

A1

CH2

CH3

CH4

SCL

15

8

7

6

SDA

CH7

CH6

CH5

ADS7828-Q1

5

14

12

13

3

4

A0

A1

CH2

CH3

CH4

SCL

15

8

7

6

SDA

CH7

CH6

CH5

ADS7828-Q1

Pullup Resistors

1 k

to 10 k

(typical)

GND

VDD

ADS7828-Q1

www.ti.com

SBAS456B – DECEMBER 2008 – REVISED JANUARY 2016

8.1.1.1 Connecting Multiple Devices

Connecting multiple ADS7828-Q1 devices to a single bus is simple. Using the address pin, the ADS7828-Q1

device can be set to one of four different I2C addresses. Figure 22 shows an example using three ADS7828-Q1

devices. Up to four ADS7828-Q1 devices (using different address pin configurations) can be connected to a

single bus.

Only one set of pullup resistors is require per bus. The pullup resistor values can be lowered slightly to

compensate for the additional bus capacitance presented by multiple devices and increased line length.

The ADS7828-Q1 power and input connections are omitted for clarity. The ADDR pin selects the I2C address.

Figure 22. Connecting Multiple ADS7828-Q1 Devices

Copyright © 2008–2016, Texas Instruments Incorporated

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