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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)： | 23/24頁 |
| 文件大?。?/td> | 236K |
| 代理商： | LTC2990IMS#PBF |
LTC2990
8
2990fa
OPERATION
The LTC2990 monitors voltage, current, internal and
remote temperatures. It can be configured through an
I2C interface to measure many combinations of these pa-
rameters. Single or repeated measurements are possible.
Remote temperature measurements use a transistor as
a temperature sensor, allowing the remote sensor to be a
discreteNPN(ex.MMBT3904)oranembeddedPNPdevice
in a microprocessor or FPGA. The internal ADC reference
minimizes the number of support components required.
The Functional Diagram displays the main components of
the device. The input signals are selected with an input
MUX, controlled by the control logic block. The control
logic uses the mode bits in the control register to manage
the sequence and types of data acquisition. The control
logic also controls the variable current sources during
remote temperature acquisition. The order of acquisitions
is fixed: TINTERNAL, V1, V2, V3, V4 then VCC. The ADC
performs the necessary conversion(s) and supplies the
data to the control logic for further processing in the case
of temperature measurements, or routing to the appropri-
ate data register for voltage and current measurements.
Current and temperature measurements, V1 – V2 or V3
– V4, are sampled differentially by the internal ADC. The
I2C interface supplies access to control, status and data
registers. The ADR1 and ADR0 pins select one of four
possible I2C addresses (see Table 2). The undervoltage
detector inhibits I2C communication below the specified
threshold. During an undervoltage condition, the part is in
a reset state, and the data and control registers are placed
in the default state of 00h.
Remotediodemeasurementsareconductedusingmultiple
ADC conversions and source currents to compensate for
sensor series resistance. During temperature measure-
ments, the V2 or V4 terminal of the LTC2990 is terminated
with a diode. The LTC2990 is calibrated to yield the correct
temperature for a remote diode with an ideality factor of
1.004. See the applications section for compensation of
sensor ideality factors other than the factory calibrated
value of 1.004.
TheLTC2990communicatesthroughanI2Cserialinterface.
The serial interface provides access to control, status and
data registers. I2C defines a 2-wire open-drain interface
supporting multiple slave devices and masters on a single
bus. The LTC2990 supports 100kbits/s in the standard
mode and up to 400kbit/s in fast mode. The four physical
addresses supported are listed in Table 2. The I2C interface
is used to trigger single conversions, or start repeated
conversions by writing to a dedicated trigger register. The
data registers contain a destructive-read status bit (data
valid), which is used in repeated mode to determine if
the register’s contents have been previously read. This
bit is set when the register is updated with new data, and
cleared when read.
VCC
V1
LTC2990
2.5V
2-WIRE
I2C
INTERFACE
5V
GND
SDA
SCL
ADR0
ADR1
V3
V4
V2
470pF
MMBT3904
RSENSE
15m
ILOAD
2990 F01
0.1F
Figure 1 is the basic LTC2990 application circuit.
Figure 1
APPLICATIONS INFORMATION
Power Up
The VCC pin must exceed the undervoltage (UV) thresh-
old of 2.5V to keep the LTC2990 out of power-on reset.
Power-on reset will clear all of the data registers and the
control register.
Temperature Measurements
The LTC2990 can measure internal temperature and up
to two external diode or transistor sensors. During tem-
perature conversion, current is sourced through either
the V1 or the V3 pin to forward bias the sensing diode.
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