ADM1169 Analog Devices, ADM1169 Datasheet - Page 31

• Manufacturer Part Number: ADM1169
• Description: Super Sequencer and Monitor with Margining Control and Non-Volatile Fault Recording
• Manufacturer: Analog Devices

Specifications of ADM1169

• # Supplies Monitored: 8
• Volt Monitoring Accuracy: 1%
• # Output Drivers: 8
• Fet Drive/enable Output: Both
• Voltage Readback: 12-bit ADC
• Supply Adj/margining: 12-bit ADC+4 DACs
• Package: 32 ld LQFP,40 ld LFCSP

•
Block Write
In a block write operation, the master device writes a block of
data to a slave device, as shown in Figure 45. The start address
for a block write must have been set previously. In the ADM1169,
a send byte operation sets a RAM address, and a write byte/word
operation sets an EEPROM address as follows:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. The master asserts a stop condition on SDA to end the
S
1
To write a single byte of data to the EEPROM. In this case, the
command byte is the high byte of EEPROM Address 0xF8
to EEPROM Address 0xFB. The first data byte is the low
byte of the EEPROM address, and the second data byte is
the actual data, as shown in Figure 43.
transaction.
The master device asserts a start condition on SDA.
The master sends the 7-bit slave address followed by
the write bit (low).
The addressed slave device asserts an ACK on SDA.
The master sends a command code that tells the slave
device to expect a block write. The ADM1169 command
code for a block write is 0xFC (1111 1100).
The slave asserts an ACK on SDA.
The master sends a data byte that tells the slave device how
many data bytes are being sent. The SMBus specification
allows a maximum of 32 data bytes in a block write.
The slave asserts an ACK on SDA.
The master sends N data bytes.
The slave asserts an ACK on SDA after each data byte.
ADDRESS
SLAVE
2
W A
Figure 43. Single Byte Write to the EEPROM
3
(0xF8 TO 0xFB)
HIGH BYTE
ADDRESS
EEPROM
4
A
5
(0x00 TO 0xFF)
1
S
LOW BYTE
ADDRESS
EEPROM
ADDRESS
SLAVE
6
2
W A
A
7
DATA
3
Figure 45. Block Write to the EEPROM or RAM
8
COMMAND 0xFC
(BLOCK WRITE)
9
A
10
P
4
Rev. 0 | Page 31 of 36
A
5
COUNT
BYTE
6
A
7
Unlike some EEPROM devices that limit block writes to within
a page boundary, there is no limitation on the start address
when performing a block write to EEPROM, except when
•
•
Note that the ADM1169 features a clock extend function for
writes to EEPROM. Programming an EEPROM byte takes
approximately 250 μs, which limits the SMBus clock for
repeated or block write operations. The ADM1169 pulls SCL
low and extends the clock pulse when it cannot accept any
more data.
READ OPERATIONS
The ADM1169 uses the following SMBus read protocols.
Receive Byte
In a receive byte operation, the master device receives a single
byte from a slave device, as follows:
1.
2.
3.
4.
5.
6.
In the ADM1169, the receive byte protocol is used to read a
single byte of data from a RAM or EEPROM location whose
address has previously been set by a send byte or write byte/
word operation, as shown in Figure 44.
DATA
8
1
There are fewer than N locations from the start address to
the highest EEPROM address (0xFBFF), which results in
writing to invalid addresses.
An address crosses a page boundary. In this case, both
pages must be erased before programming.
The master device asserts a start condition on SDA.
The master sends the 7-bit slave address followed by the
read bit (high).
The addressed slave device asserts an ACK on SDA.
The master receives a data byte.
The master asserts a NACK on SDA.
The master asserts a stop condition on SDA, and the
transaction ends.
A
9
DATA
Figure 44. Single Byte Read from the EEPROM or RAM
2
1
S
A
ADDRESS
DATA
SLAVE
N
2
A P
10
R
A
3
DATA
4
A
5
P
6
ADM1169