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CS5461A
8. AUTO-BOOT MODE USING E 2 PROM
When the CS5461A MODE pin is asserted (logic 1), the
CS5461A auto-boot mode is enabled. In auto-boot
mode, the CS5461A downloads the required com-
mands and register data from an external serial
E 2 PROM, allowing the CS5461A to begin performing
energy measurements.
8.1 Auto-Boot Configuration
A typical auto-boot serial connection between the
CS5461A and a E 2 PROM is illustrated in Figure 14 . In
auto-boot mode, the CS5461A’s CS and SCLK are con-
figured as outputs. The CS5461A asserts CS, provides
a clock on SCLK, and sends a read command to the
E 2 PROM on SDO. The CS5461A reads the user-speci-
fied commands and register data presented on the SDI
pin. The E 2 PROM’s programmed data is utilized by the
CS5461A to change the designated registers’ default
values and begin registering energy.
operation, when the auto-boot initialization sequence is
running. Any of the valid commands can be used.
8.2 Auto-Boot Data for E 2 PROM
Below is an example code set for an auto-boot se-
quence. This code is written into the E 2 PROM by the us-
er. The serial data for such a sequence is shown below
in single-byte, hexidecimal notation:
- 40 00 00 61
Write Configuration Register, turn high-pass filters
on, set K=1.
- 44 7F C4 A9
Write value of 0x7FC4A9 to Current Gain
Register.
- 48 FF B2 53
Write value of 0xFFB253 to Voltage Gain
Register.
- 4C 00 7D 00
5K
V D +
EOUT1
EOUT2
CS5461A
SCLK
SDI
Mech. Counter
or
Stepper Motor
EEPROM
SCK
SO
Set PulseRateE 1,2 Register to 1000 Hz.
- 74 00 00 04
Unmask bit #2 (LSD) in the Mask Register).
- E8
Start continuous conversions
- 78 00 01 00
MODE
SDO
CS
5K
SI
CS
Write STOP bit to Control Register, to terminate
auto-boot initialization sequence.
8.3 Suggested E 2 PROM Devices
Several industry-standard, serial E 2 PROMs that will
Connector to Calibrator
Figure 14. Typical Interface of E 2 PROM to CS5461A
successfully run auto-boot with the CS5461A are listed
below:
? Atmel AT25010, AT25020 or AT25040
?
?
National Semiconductor NM25C040M8 or NM25020M8
Xicor X25040SI
Figure 14 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 2 PROM. The user-specified
commands/data will determine the CS5461A’s exact
38
These types of serial E 2 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 2 PROM at the be-
ginning of the auto-boot sequence.
DS661F3
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