ADP1053 AD [Analog Devices], ADP1053 Datasheet - Page 34

• Manufacturer Part Number: ADP1053
• Description: 3-Channel Digital
• Manufacturer: AD [Analog Devices]

ADP1053
PMBus/I
The PMBus slave allows a device to interface to a PMBus-
compliant master device, as specified by the PMBus Power
System Management Protocol Specification (Revision 1.1,
February 5, 2007). The PMBus slave is a 2-wire interface that
can be used to communicate with other PMBus-compliant
devices and is compatible in a multimaster, multislave bus
configuration.
FEATURES
The function of the PMBus slave is to decode the command sent
from the master device and respond as requested. Communi-
cation is established using an I
a clock line (SCL) and data line (SDA). The PMBus slave is
designed to externally move chunks of 8-bit data (bytes) while
maintaining compliance with the PMBus protocol. The PMBus
protocol is based on the SMBus Specification (Version 2.0,
August 2000). The SMBus specification is, in turn, based on
the Philips I
The PMBus incorporates the following features:
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OVERVIEW
The PMBus slave module is a 2-wire interface that can be used
to communicate with other PMBus-compliant devices. Its trans-
fer protocol is based on the Philips I
ADP1053
system. The
using one data pin (SDA) and one clock pin (SCL). Because the
ADP1053
However, it is capable of clock-stretching the SCL line to put the
master device in a wait state when it is not ready to respond to
the master’s request.
Communication is initiated when the master device sends a
command to the PMBus slave device. Commands can be read
or write commands, in which case data is transferred between
the devices in a byte wide format. Commands can also be send
commands, in which case the command is executed by the slave
device upon receiving the stop bit. The stop bit is the last bit in a
complete data transfer, as defined in the PMBus/I
cation protocol. During communication, the master and slave
devices send acknowledge (A) or not-acknowledge ( A ) bits as a
method of handshaking between devices. See the PMBus speci-
fication for a more detailed description of the communication
protocol.
Slave operation on multiple device systems
7-bit addressing
100 kHz and 400 kHz data rates
General call address support
Support for clock low extension (clock stretching)
Separate multibyte receive and transmit FIFO
Extensive fault monitoring
is always configured as a slave device in the overall
is a slave device, it cannot generate the clock signal.
2
ADP1053
C Bus Specification (Version 2.1, January 2000).
2
C COMMUNICATION
communicates with the master device
2
C-like 2-wire interface with
2
C transfer mechanism. The
2
C communi-
Rev. A | Page 34 of 84
When communicating with the master device, it is possible
for illegal or corrupted data to be received by the PMBus slave
device. In this case, the PMBus slave device should respond to
the invalid command or data, as defined by the PMBus specifi-
cation, and indicate to the master device that an error or fault
condition has occurred. This method of handshaking can be used
as a first level of defense against inadvertent programming of
the slave device that can potentially damage the chip or system.
The PMBus specification defines a set of generic PMBus
commands that is recommended for a power management
system. However, each PMBus device manufacturer can choose
to implement and support certain commands as it deems fit for
its system. In addition, the PMBus device manufacturer can
choose to implement manufacturer-specific commands whose
functions are not included in the generic PMBus command set.
The list of standard PMBus and manufacturer-specific commands
can be found in the PMBUS Command Set (Supported by the
ADP1053) section and the Manufacturer-Specific Extended
Command List section.
PMBus/I
The PMBus address of the
external resistor from the ADD pin to AGND. Table 11 lists the
recommended resistor values and associated PMBus addresses.
Seven different addresses can be used.
Table 11. PMBus Address Settings and Resistor Values
PMBus Address
0x60
0x61
0x62
0x63
0x64
0x65
0x67
The recommended resistor values in Table 11 can vary by ±2 kΩ.
Therefore, it is recommended that 1% tolerance resistors be used
on the ADD pin.
The part responds to the standard PMBus broadcast address
(general call) of 0x00. However, it is not recommended that the
general call address be used when more than one
connected to the master device because the data returned by
multiple slave devices will be corrupted.
For more information, see the General Call Support section.
2
C ADDRESS
ADD Pin Resistor Value (kΩ)
10 (or connect directly to AGND)
28.7
48.7
68.1
88.7
109
200 (or connect directly to VDD)
ADP1053
is set by connecting an
Data Sheet
ADP1053
is