MAX16048 Maxim Integrated Products, MAX16048 Datasheet - Page 48

• Manufacturer Part Number: MAX16048
• Description: (MAX16046 / MAX16048) 12-Channel/8-Channel EEPROM-Programmable System Managers
• Manufacturer: Maxim Integrated Products

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12-Channel/8-Channel EEPROM-Programmable
System Managers with Nonvolatile Fault Registers
The acknowledge bit (ACK) is the 9th bit attached to
any 8-bit data word. The receiving device always gen-
erates an ACK. The MAX16046/MAX16048 generate an
ACK when receiving an address or data by pulling SDA
low during the 9th clock period (Figure 11). When
transmitting data, such as when the master device
reads data back from the MAX16046/MAX16048, the
device waits for the master device to generate an ACK.
Monitoring ACK allows for detection of unsuccessful
data transfers. An unsuccessful data transfer occurs if
the receiving device is busy or if a system fault has
occurred. In the event of an unsuccessful data transfer,
the bus master should reattempt communication at a
later time. The MAX16046/MAX16048 generate a NACK
after the command byte received during a software
reboot, while writing to the EEPROM, or when receiving
an illegal memory address.
Figure 11. Acknowledge
48
TRANSMITTER
RECEIVER
______________________________________________________________________________________
SDA BY
SDA BY
SCL
S
1
Acknowledge
2
Use the slave address input, A0, to allow multiple identi-
cal devices to share the same serial bus. Connect A0 to
GND, DBP (or an external supply voltage greater than
2V), SCL, or SDA to set the device address on the bus.
See Table 31 for a listing of all possible 8-bit addresses.
Table 31. Setting the I
Address
X = Don’t Care.
CLOCK PULSE FOR ACKNOWLEDGE
SDA
SCL
A0
0
1
8
2
SLAVE ADDRESS
C/SMBus Slave
101000X
101001X
101010X
101011X
NACK
ACK
9
Slave Address