AD5231 datasheet(21/28 Pages) AD

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Data Sheet

AD5231

Rev. D | Page 21 of 28

PROGRAMMING EXAMPLES

The following programming examples illustrate a typical

sequence of events for various features of the AD5231. See

Table 7 for the instructions and data-word format. The

instruction numbers, addresses, and data appearing at SDI

and SDO pins are in hexadecimal format.

Table 13. Scratchpad Programming

SDI

SDO

Action

0xB00100

0xXXXXXX

Writes data 0x100 into RDAC register,

Wiper W moves to 1/4 full-scale position.

Table 14. Incrementing RDAC Followed by Storing the

Wiper Setting to EEMEM

SDI

SDO

Action

0xB00100

0xXXXXXX

Writes data 0x100 into RDAC register,

Wiper W moves to 1/4 full-scale

position.

0xE0XXXX

0xB00100

Increments RDAC register by one to

0x101.

0xE0XXXX

Increments RDAC register by one to

0x102. Continue until desired wiper

position is reached.

0x20XXXX

0xXXXXXX

Stores RDAC register data into

EEMEM(0). Optionally tie WP to GND

to protect EEMEM values.

The EEMEM value for the RDAC can be restored by power-on,

by strobing the PR pin, or by programming, as shown in

Table 15.

Table 15. Restoring the EEMEM Value to the RDAC Register

SDI

SDO

Action

0x10XXXX

0xXXXXXX

Restores the EEMEM(0) value to the

RDAC register.

0x00XXXX

0x10XXXX

NOP. Recommended step to minimize

power consumption.

Table 16. Using Left-Shift by One to Increment 6 dB Step

SDI

SDO

Action

0xC0XXXX

0xXXXXXX

Moves the wiper to double the

present data contained in the RDAC

Table 17. Storing Additional User Data in EEMEM

SDI

SDO

Action

0x32AAAA

0xXXXXXX

Stores data 0xAAAA in the extra

EEMEM location USER1. (Allowable to

address in 14 locations with a

maximum of 16 bits of data.)

0x335555

0x32AAAA

Stores data 0x5555 in the extra

EEMEM location USER2. (Allowable to

address in 14 locations with a

maximum of 16 bits of data.)

Table 18. Reading Back Data from Memory Locations

SDI

SDO

Action

0x92XXXX

0xXXXXXX

Prepares data read from EEMEM(2)

location.

0x00XXXX

0x92AAAA

NOP Instruction 0 sends a 24-bit word

out of SDO, where the last 16 bits

contain the contents in the EEMEM(2)

location. The NOP command ensures

that the device returns to the idle

power dissipation state.

Table 19. Reading Back Wiper Settings

SDI

SDO

Action

0xB00200

0xXXXXXX

Writes RDAC to midscale.

0xC0XXXX

0xB00200

Doubles RDAC from midscale to full

scale (left-shift instruction).

0xA0XXXX

0xC0XXXX

Prepares reading wiper setting from

RDAC register.

0xXXXXXX

0xA003FF

Reads back full-scale value from SDO.

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