AD5100EVAL datasheet(21/32 Pages) AD

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Preliminary Technical Data

AD5100

Rev. PrJ | Page 21 of 32

Digital Interface

All programmable parameters are set through a 2-wire I2C

protocol with read/write access to the registers. All

programmable parameters can be set permanently by

blowing the OTP fuses at users’ factories. Analog Devices

offers device programming software, which effectively

replaces the need for external I2C controllers or host

processors for OTP programming in the factories.

SCL

Serial Input Register Clock Pin. Shifts in one bit at a time on

positive clock edges. External 1k-2.2kΩ pull-up resistor is

needed. The pull-up resistor should tie to V3MON if it is used

to monitor a sub-5V source.

SDA

Serial Data Input/Output Pin. Shifts in one bit at a time on

positive clock edges. MSB loaded first. External 1k-2.2kΩ

pull-up resistor is needed. The pull-up resistor should tie to

V3MON if it is used to monitor a sub-5V source.

AD0

I2C Slave Address Pin. AD5100 is a slave device that will

communicate with a master if the AD0 bit in the protocol

matches with the logic state of the AD5100’s AD0 pin. Table 8

and Figure 20 show the example with two AD5100 devices

operate on the same serial bus independently.

Table 8. Slave Address Decoding Scheme

AD0

Program

ming Bit

AD0

Device

Address

0x2E

(U1)

0x2F

(U2)

Figure 20. Two AD5100 Devices on One Bus

The master-device output bus-line drivers are open-drain pull-

downs in a fully I2C compatible interface.

AD5100 Register Map

Table 9 outlines the Address Pointer Registers used to configure

and control all parameters and functions in the AD5100. Table

10 shows the Address Pointer Register Structure. Table 9 also

outlines if registers are writable, readable, or permanently

settable. All registers are single-port, meaning they have the

same address for read and write operations. The AD5100 ships

from its manufacturing factory with default power-up values as

listed in the last column. The user can experiment with

different settings in the various threshold, delay and

configuration registers. Once enough evaluation is done, the

user can program their own power-up default values via a one

time program (OTP) feature. When all desired settings have

been programmed (or the user is satisfied with the

manufacturers defaults), a lock-out bit can be set to prevent

further/erroneous settings from being programmed.

Some users will use the AD5100 as a ‘set and forget’ device, i.e.

program some default values and never need to change these

over the life of the application. However some users will require

‘On the Fly’ flexibility, i.e. the ability to change settings to values

other than those they choose as their defaults. An additional

feature of the AD5100 is the ability to temporarily over-ride the

OTP executed settings and still allows users to program the

parts dynamically in the field. All over-ride values will revert

back to OTP executed settings once the AD5100 is power

cycled.

later in the I2C section.

MASTER

SDA SCL

AD0

SDA SCL

AD0

SDA

SCL

AD5100

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