CS5461 datasheet(28/46 Pages) CIRRUS

28 / 46 page

CS5461

DS546PP2

Figure 13 also shows the external connections that

would be made to a calibrator device, such as a PC

or custom calibration board. When the metering

system is installed, the calibrator would be used to

control calibration and/or to program user-speci-

fied commands and calibration values into the EE-

PROM. The user-specified commands/data will

determine the CS5461’s exact operation, when the

auto-boot initialization sequence is running. Any of

the valid commands can be used.

5.6.2 Auto-Boot Data for EEPROM

Below is an example code set for an auto-boot se-

quence. This code is written into the EEPROM by

the user. The serial data for such a sequence is

shown below in single-byte hexidecimal notation:

40 00 00 61

;In Configuration Register,

turn high-pass filters on, set

K=1.

44 7F C4 A9

;Write value of 0x7FC4A9 to

Current Gain Register.

46 7F B2 53

;Write value of 0xFFB253 to

DC Voltage Offset Register.

4C 00 00 14

;Set PulseRateE Register to

0.625 Hz.

74 00 00 04

;Unmask bit #2 (“LSD” bit in

the Mask Register).

;Start continuous conversions

78 00 01 40

;Write STOP bit to Control

to-boot

initialization

se-

quence, and set the EOUT

pulse output to Mechanical

Counter Format.

5.6.3 Which EEPROMs Can Be Used?

Several industry-standard serial EEPROMs that

will successfully run auto-boot with the CS5461

are listed below:

•

Atmel

AT25010

AT25020

AT25040

•

National Semiconductor

NM25C040M8

NM25020M8

•

Xicor

X25040SI

These types of serial EEPROMs expect a specific

8-bit command word (00000011) in order to per-

form a memory download. The CS5461 has been

hardware programmed to transmit this 8-bit com-

mand word to the EEPROM at the beginning of the

auto-boot sequence.

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