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參數(shù)資料
| 型號： | LTC2990CMS#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 4/24頁 |
| 文件大小： | 236K |
| 代理商： | LTC2990CMS#PBF |
LTC2990
12
2990fa
APPLICATIONS INFORMATION
where RSENSE is the current sensing resistor, typically
<1Ω.
VCC:TheLTC2990measuresVCC.Toconvertthecontentsof
the VCC register to voltage, use the following equation:
VCC = 2.5 + D[13:0] 305.18V
Digital Interface
The LTC2990 communicates with a bus master using a
two-wire interface compatible with the I2C Bus and the
SMBus, an I2C extension for low power devices.
The LTC2990 is a read-write slave device and supports
SMBusbusReadByteDataandWriteByteData,ReadWord
Data and Write Word Data commands. The data formats
for these commands are shown in Tables 3 though 10.
The connected devices can only pull the bus wires LOW
and can never drive the bus HIGH. The bus wires are
externally connected to a positive supply voltage via a
current source or pull-up resistor. When the bus is free,
both lines are HIGH. Data on the I2C bus can be transferred
at rates of up to 100kbit/s in the standard mode and up to
400kbit/s in the fast mode. Each device on the I2C bus is
recognized by a unique address stored in that device and
can operate as either a transmitter or receiver, depending
on the function of the device. In addition to transmitters
and receivers, devices can also be considered as masters
or slaves when performing data transfers. A master is
the device which initiates a data transfer on the bus and
generates the clock signals to permit that transfer. At the
same time any device addressed is considered a slave.
The LTC2990 can only be addressed as a slave. Once ad-
dressed, it can receive configuration bits or transmit the
last conversion result. Therefore the serial clock line SCL
is an input only and the data line SDA is bidirectional. The
device supports the standard mode and the fast mode for
data transfer speeds up to 400kbit/s. The Timing Diagram
shows the definition of timing for fast/standard mode
devices on the I2C bus.
The internal state machine cannot
updateinternaldataregistersduringanI2Creadoperation.
The state machine pauses until the I2C read is complete.
It is therefore, important not to leave the LTC2990 in this
state for long durations, or increased conversion latency
will be experienced.
START and STOP Conditions
When the bus is idle, both SCL and SDA must be high. A
bus master signals the beginning of a transmission with
a START condition by transitioning SDA from high to low
while SCL is high. When the bus is in use, it stays busy
if a repeated START (SR) is generated instead of a STOP
condition. The repeated START (SR) conditions are func-
tionally identical to the START (S). When the master has
finished communicating with the slave, it issues a STOP
condition by transitioning SDA from low to high while SCL
is high. The bus is then free for another transmission.
I2C Device Addressing
Four distinct bus addresses are configurable using the
ADR0-ADR1 pins. Table 2 shows the correspondence
between ADR0 and ADR1 pin states and addresses.
Acknowledge
The acknowledge signal is used for handshaking between
thetransmitterandthereceivertoindicatethatthelastbyte
of data was received. The transmitter always releases the
SDA line during the acknowledge clock pulse. When the
slave is the receiver, it must pull down the SDA line so that
it remains LOW during this pulse to acknowledge receipt
of the data. If the slave fails to acknowledge by leaving
SDA HIGH, then the master can abort the transmission by
generatingaSTOPcondition.Whenthemasterisreceiving
data from the slave, the master must pull down the SDA
line during the clock pulse to indicate receipt of the data.
After the last byte has been received the master will leave
the SDA line HIGH (not acknowledge) and issue a STOP
condition to terminate the transmission.
Write Protocol
The master begins communication with a START condi-
tion followed by the seven bit slave address and the R/W#
bit set to zero. The addressed LTC2990 acknowledges
the address and then the master sends a command byte
which indicates which internal register the master wishes
to write. The LTC2990 acknowledges the command byte
and then latches the lower four bits of the command byte
into its internal Register Address pointer. The master then
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