REV. B

AD5241/AD5242

–12–

out affecting the wiper settings.

1. Start, Slave Address Byte, Acknowledge, Instruction Byte

2. Complete the write cycle with Stop, then Start, Slave Address

fied, Acknowledge, Stop.

3. Do not complete the write cycle by not issuing the Stop, then

Start, Slave Address Byte, Acknowledge, Instruction Byte

All digital inputs are protected with a series input resistor and

parallel Zener ESD structures shown in Figure 9. This applies

to digital input Pins SDA, SCL, and

SHDN.

SELF-CONTAINED SHUTDOWN FUNCTION

Shutdown can be activated by strobing the

SHDN Pin or pro-

gramming the SD Bit in the Write Mode Instruction Byte. In

addition, shutdown can even be implemented with the device

digital output as shown in Figure 8. In this configuration, the

device will be shut down during power-up, but users are allowed

device will exit from the shutdown mode and respond to the

new setting. This self-contained shutdown function allows abso-

lute shutdown during power-up, which is crucial in hazardous

environments without adding extra components.

SDA

SHDN

SCL

O1

Figure 8. Shutdown by Internal Logic Output

340

LOGIC

Figure 9. ESD Protection of Digital Pins

A,B,W

Figure 10. ESD Protection of Resistor Terminals