CS5461-IS View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS5461-IS

Single Phase Bi-Directional Power/Energy IC

Cirrus Logic 

CS5461

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).

E8

78 00 01 40

;Start continuous conversions

;Write STOP bit to Control

Register, to terminate au-

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.

DS546F2

27

Share Link: