Cirrus-logic CS5463 User Manual download pdf (Page 40)

CS5463

40 DS678F3

8. AUTO-BOOT MODE USING E

PROM

When the CS5463 MODE pin is asserted (logic 1), the

CS5463

auto-boot mode is enabled. In auto-boot mode,

the CS5463 downloads the required commands and

PROM, allowing

the CS5463 to begin performing energy measurements.

8.1 Auto-boot Configuration

A typical auto-boot serial connection between the

CS5463 and a E

PROM is illustrated in Figure 17. In au-

to-boot mode, the CS5463’s CS

and SCLK are config-

ured as outputs. The CS5463 asserts CS

(logic 0),

provides a clock on SCLK, and sends a read command

to the E

PROM on SDO. The CS5463 reads the us-

er-specified commands and register data presented on

the SDI pin. The E

PROM’s programmed data is utilized

by the CS5463 to change the designated registers’ de-

fault values and begin registering energy.

Figure 17 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 calibra-

tion and/or to program user-specified commands and

calibration values into the E

PROM. The user-specified

commands/data will determine the CS5463’s exact op-

eration, when the auto-boot initialization sequence is

running. Any of the valid commands can be used.

8.2 Auto-boot Data for E

PROM

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

quence. This code is written into the E

PROM by the us-

er. The serial data for such a sequence is shown below

in single-byte hexidecimal notation:

-64 00 00 60

Write Operation Mode Register, turn high-pass

filters on.

-44 7F C4 A9

Write value of 0x7FC4A9 to Current Gain

-48 FF B2 53

Write value of 0xFFB253 to Voltage Gain

-74 00 00 04

Unmask bit #2 (LSD) in the Mask Register.

-E8

Start continuous conversions

-78 00 01 00

Write STOP bit to Control Register, to terminate

auto-boot initialization sequence.

8.3 Which E

PROMs Can Be Used?

Several industry-standard serial E

PROMs that will suc-

cessfully run auto-boot with the CS5461A are listed be-

low:

• Atmel AT25010, AT25020 or AT25040

• National Semiconductor NM25C040M8 or NM25020M8

• Xicor X25040SI

These types of serial E

PROMs expect a specific 8-bit

command (00000011) in order to perform a memory

read. The CS5461A has been hardware programmed to

transmit this 8-bit command to the E

PROM at the be-

ginning of the auto-boot sequence.

CS5463

EEPROM

EOUT1

EOUT2

MODE

SCLK

SDI

SDO

SCK

Connector to Calibrator

VD+

5 K

Mech. Counter

Stepper Motor

Figure 17. Typical Interface of E

PROM to CS5463

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