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參數(shù)資料
| 型號： | LTC2990IMS#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)： | 5/24頁 |
| 文件大?。?/td> | 236K |
| 代理商： | LTC2990IMS#PBF |
LTC2990
13
2990fa
APPLICATIONS INFORMATION
delivers the data byte and the LTC2990 acknowledges
once more and latches the data into its internal register.
The transmission is ended when the master sends a STOP
condition. If the master continues sending a second data
byte, as in a Write Word command, the second data byte
willbeacknowledgedbytheLTC2990andwrittentothenext
register in sequence, if this register has write access.
Read Protocol
ThemasterbeginsareadoperationwithaSTARTcondition
followed by the seven bit slave address and the R/W# bit
settozero.TheaddressedLTC2990acknowledgesthisand
then the master sends a command byte which indicates
which internal register the master wishes to read. The
LTC2990acknowledgesthisandthenlatchesthelowerfour
bitsofthecommandbyteintoitsinternalRegisterAddress
pointer.ThemasterthensendsarepeatedSTARTcondition
followed by the same seven bit address with the R/W# bit
now set to one. The LTC2990 acknowledges and sends
the contents of the requested register. The transmission
is ended when the master sends a STOP condition. The
register pointer is automatically incremented after each
byte is read. If the master acknowledges the transmitted
data byte, as in a Read Word command, the LTC2990
will send the contents of the next sequential register as
the second data byte. The byte following register 0x0F is
register 0x00, or the status register.
Control Register
The control register (Table 5) determines the selected
measurement mode of the device. The LTC2990 can be
configured to measure voltages, currents and tempera-
tures.Thesemeasurementscanbesingle-shotorrepeated
measurements. Temperatures can be set to report in
Celsius or Kelvin temperature scales. The LTC2990 can be
configured to run particular measurements, or all possible
measurementspertheconfigurationspecifiedbythemode
bits. The power-on default configuration of the control
register is set to 0x00, which translates to a repeated
measurement of the internal temperature sensor, when
triggered. This mode prevents the application of remote
diode test currents on pins V1 and V3, and remote diode
terminations on pins V2 and V4 at power-up.
Status Register
The status register (Table 4) reports the status of a par-
ticular conversion result. When new data is written into a
particular result register, the corresponding DATA_VALID
bit is set. When the register is addressed by the I2C inter-
face, the status bit (as well as the DATA_VALID bit in the
respectiveregister)iscleared.Thehostcanthendetermine
if the current available register data is new or stale. The
busy bit, when high, indicates a single-shot conversion is
in progress. The busy bit is always high during repeated
mode, after the initial conversion is triggered.
STOP
2990 F04
START
ADDRESS
R/W
P
9
8
1-7
a6-a0
b7-b0
9
8
9
8
S
DATA
ACK
Figure 4. Data Transfer Over I2C or SMBus
S
A
A DATA
W#
ADDRESS
COMMAND
A
0
0 b7:b0
0
10011a1:a0
FROM MASTER TO SLAVE
XXXXXb3:b0
0
2990 F05
P
FROM SLAVE TO MASTER
A: ACKNOWLEDGE (LOW)
A#: NOT ACKNOWLEDGE (HIGH)
R: READ BIT (HIGH)
W#: WRITE BIT (LOW)
S: START CONDITION
P: STOP CONDITION
Figure 5. LTC2990 Serial Bus Write Byte Protocol
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