12-Channel/8-Channel, Flash-Configurable System
Managers with Nonvolatile Fault Registers
MAX16065/MAX16066
______________________________________________________________________________________ 41
CRC-8 error check byte is added in the data string dur-
ing each read and/or write sequence. Enable PEC by
writing a ‘1’ to r8Bh[7].
The CRC-8 byte is calculated using the polynomial
C = X
8
+ X
2
+ X + 1
The PEC calculation includes all bytes in the transmis-
sion, including address, command, and data. The PEC
calculation does not include ACK, NACK, START, STOP,
or REPEATED START.
Command Codes
The MAX16065/MAX16066 use eight command codes
for block read, block write, and other commands. See
Table 28 for a list of command codes.
To initiate a software reboot, send A7h using the send byte
format. A software-initiated reboot is functionally the same
as a hardware-initiated power-on reset. During boot-up,
flash configuration data in the range of 230h to 28Ch is
copied to r30h to r8Ch registers in the default page.
Send command code A8h to trigger a fault store to flash.
Configure the Critical Fault Log Control register (6Dh) to
store ADC conversion results and/or fault flags.
While in the flash page, send command code A9h to
access the flash page (addresses from 200h to 28Fh).
Once command code A9h has been sent, all addresses
are recognized as flash addresses only. Send command
code AAh to return to the default page (addresses from
000h to 0FFh). Send command code ABh to access
the user flash-page (addresses from 300h to 3A4h and
3ADh to 3FFh), and send command code ACh to return
to the flash page.
Table 26. SMBus Settings Register
Table 27. Setting the SMBus Slave Address
R = Read/Write select bit.
Table 28. Command codes
REGISTER
ADDRESS
FLASH ADDRESS BIT RANGE DESCRIPTION
8Bh 28Bh
[6:0]
SMBus Slave Address Register. Set to 00h to use A0
pin address setting.
[7] 1 = Enable PEC (packet error check).
SLAVE ADDRESSES
A0 SLAVE ADDRESS
0 1010 000R
1 1010 001R
SCL 1010 010R
SDA 1010 011R
COMMAND
CODE
ACTION
A5h Block write
A6h Block read
A7h Reboot flash in register file
A8h Trigger emergency save to flash
A9h Flash page access ON
AAh Flash page access OFF
ABh User flash access ON (must be in flash page already)
ACh User flash access OFF (return to flash page)
(1 Seiten)
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