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Data Sheet
VOLTAGE AND CURRENT READBACK
In addition to providing hot swap functionality, the ADM1177
also contains the components to allow voltage and current
readback over an I 2 C bus. The voltage output of the current
sense amplifier and the voltage on the VCC pin are fed into a
12-bit ADC via a multiplexer. The device can be instructed to
convert voltage and/or current at any time during operation via
an I 2 C command. When all conversions are complete, the
voltage and/or current values can be read back with 12-bit
accuracy in two or three bytes.
ADM1177
The peripheral whose address corresponds to the trans-
mitted address responds by pulling the data line low during
the low period before the ninth clock pulse, known as the
acknowledge bit, and holding it low during the high period
of this clock pulse. All other devices on the bus now
remain idle while the selected device waits for data to be
read from it or written to it. If the R/W bit is 0, the master
writes to the slave device. If the R/W bit is 1, the master
reads from the slave device.
SERIAL BUS INTERFACE
Control of the ADM1177 is carried out via the I 2 C bus. This
interface is compatible with I 2 C fast mode (400 kHz maximum).
The ADM1177 is connected to this bus as a slave device under
the control of a master device.
IDENTIFYING THE ADM1177 ON THE I 2 C BUS
The ADM1177 has a 7-bit serial bus slave address. When the
device powers up, it does so with a default serial bus address.
The five MSBs of the address are set to 10110; the two LSBs are
determined by the state of the ADR pin. There are four different
configurations available on the ADR pin that correspond to four
different I 2 C addresses for the two LSBs (see Table 5). This scheme
allows four ADM1177 devices to operate on a single I 2 C bus.
GENERAL I 2 C TIMING
and read operations using the I 2 C. The I 2 C specification defines
conditions for different types of read and write operations,
which are discussed in the Write and Read Operations section.
The general I 2 C protocol operates as follows:
2.
3.
Data is sent over the serial bus in sequences of nine clock
pulses: eight bits of data followed by an acknowledge bit
from the slave device. Data transitions on the data line
must occur during the low period of the clock signal and
remain stable during the high period, because a low-to-
high transition when the clock is high can be interpreted as
a stop signal.
If the operation is a write operation, the first data byte after
the slave address is a command byte. This tells the slave
device what to expect next. It can be an instruction, such as
telling the slave device to expect a block write; or it can be
a register address that tells the slave where subsequent data
is to be written.
Because data can flow in only one direction, as defined by
the R/W bit, it is not possible to send a command to a slave
device during a read operation. Before performing a read
operation, it may be necessary to first execute a write
operation to tell the slave what sort of read operation to
expect and/or the address from which data is to be read.
When all data bytes are read or written, stop conditions are
1.
The master initiates data transfer by establishing a start
condition, defined as a high-to-low transition on the serial
data line, SDA, while the serial clock line, SCL, remains high.
This indicates that a data stream is to follow. All slave
peripherals connected to the serial bus respond to the start
condition and shift in the next eight bits, consisting of a
7-bit slave address (MSB first), plus an R/W bit that
determines the direction of the data transfer, that is,
established. In write mode, the master pulls the data line
high during the 10 th clock pulse to assert a stop condition.
In read mode, the master device releases the SDA line
during the SCL low period before the ninth clock pulse,
but the slave device does not pull it low. This is known as a
no acknowledge. The master then takes the data line low
during the SCL low period before the 10 th clock pulse, then
high during the 10 th clock pulse to assert a stop condition.
whether data is written to or read from the slave device
(0 = write, 1 = read).
Table 5. Setting I 2 C Addresses via the ADR Pin
Base Address
10110
ADR Pin State
Ground
Resistor to ground
Floating
High
ADR Pin Logic State
00
01
10
11
Address in Binary 1
1011000X
1011001X
1011010X
1011011X
Address in Hex
0xB0
0xB2
0xB4
0xB6
1
X = don’t care.
Rev. C | Page 15 of 24
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