AD5100EVAL datasheet(27/32 Pages) AD

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Preliminary Technical Data

AD5100

Rev. PrJ | Page 27 of 32

Programming

Sequence

0x5C

0x01

0x8F

Delay

0x5D

Comment

Start

Slave

Addr

ess

Write

Ack

Set

V1MON

Thres

hold

Ack

OTP

setti

Ack

Stop

Wait

for

30ms

Start

Slave

Addr

ess

Read

Figure 24. Example of Executing OTP and a Successful Validation

When all default registers have been programmed, the lock bit

should be set. User programmed defaults won’t become active until

the first power cycle after the lock bit is set. Programming the lock

bit is done in exactly the same manner as all other registers.

Temporary Over-Ride of Default Settings (Over-Ride

Function)

As stated previously in the register map section, even with the lock

bit set, it is possible to temporarily over-ride the default values of

any of the permanently programmable registers. To Over-Ride a

permanent setting in a particular register, the following sequence

should be used:

Set bit [3] in register 0x16 (Special Functions 1)

Write the desired temporary data to the register of choice

While the Over-Ride bit is set in register 0x18, the user may over-

ride any registers they wish by simply writing to them with new

data.

To revert an over-ridden register back to its default setting, the

following sequence should be used:

Clear bit [3] in register 0x16

Write a dummy byte to the register of choice

Clearing the Over-Ride bit in register 0x18 does not cause all over-

ridden registers to revert back to their defaults at the same time.

For example, imagine the user had over-ridden registers 0x01, 0x02

& 0x03. If the user now cleared the Over-Ride bit in register 0x16

and wrote a dummy byte to register 0x01, it would revert back to its

default value. However registers 0x02 & 0x03 would still contain

their Over-Ride data. To revert both registers back to their defaults,

the user must write dummy data to each register individually.

Power cycling the AD5100 will also revert all registers back to their

programmed defaults.

Controlling the AD5100

There are two ways to control the AD5100. Users can apply the

AD5100 evaluation software for one time programming the

devices in the factory without ever reprogramming the parts in

the fields. They can also design or make use of the on-board I2C

controllers for programming the AD5100. The later is necessary

for any dynamic or field programming applications.

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