参数资料
型号: LTC2991IMS#PBF
厂商: LINEAR TECHNOLOGY CORP
元件分类: 电源管理
英文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
封装: LEAD FREE, PLASTIC, MSOP-16
文件页数: 3/32页
文件大小: 230K
代理商: LTC2991IMS#PBF
LTC2991
11
2991f
OPERATION
The LTC2991 monitors voltage, current, internal and remote
temperatures. It can be configured through an I2C inter-
face to measure many combinations of these parameters.
Single or repeated measurements can be configured.
Remote temperature measurements use transistors as
temperature sensors, allowing the remote sensor to be a
discrete NPN (ex. MMBT3904) or an embedded PNP device
in a microprocessor or FPGA. The internal ADC reference
minimizes the number of support components required.
The Functional Diagram displays the main functional com-
ponents of the device. The input signals are selected with an
input mux, controlled by the control logic block. The control
logic block uses the mode bits in the control registers to
manage the sequence and types of data acquisition. The
control logic block also controls the current sources during
remote temperature acquisition. The order of acquisitions
is fixed: V1, V2, V3, V4, V5, V6, V7, V8, TINTERNAL then
VCC. The ADC performs the necessary conversion(s) and
supplies the data to the control logic for routing to the ap-
propriate data register. The I2C interface supplies access
to control, status and data registers. The ADR2, ADR1 and
ADR0 pins select one of eight possible I2C addresses (see
Table 1). The UVLO 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.
Remote diode measurements are conducted using multiple
ADC conversions and source currents to compensate for
sensor series resistance. The V2, V4, V6 or V8 terminals of
the LTC2991 are terminated with a diode if that channel is
configured for temperature measurements. It is acceptable
to ground these pins, but increased noise may result on
the temperature measurements. The LTC2991 is calibrated
to yield the correct temperature for a remote diode with an
ideality factor of 1.004. See the Applications Information
section for compensation of sensor ideality factors other
than the factory calibrated value of 1.004.
The LTC2991 communicates through an I2C serial in-
terface. 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 LTC2991 supports 100kbit/s in the
standard mode and up to 400kbit/s in fast mode. The
eight physical addresses supported are listed in Table 1.
The I2C interface is used to trigger single conversions, or
start repeated conversions by writing to a dedicated trig-
ger register. The data registers contain a destructive read
status bit (data valid), which is used in repeated mode to
determine if the registers contents have been previously
read. This bit is set when the register is updated with new
data, and cleared when read.
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