LM134 datasheet(7/26 Pages) AD

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LTC2990

Rev. F

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PIN FUNCTIONS

V1 (Pin 1): First Monitor Input. This pin can be config-

ured as a single-ended input or the positive input for a

differential or remote diode temperature measurement (in

combination with V2). When configured for remote diode

temperature, this pin will source a current.

V2 (Pin 2): Second Monitor Input. This pin can be con-

figured as a single-ended input or the negative input for a

differential or remote diode temperature measurement (in

combination with V1). When configured for remote diode

temperature, this pin will have an internal termination,

while the measurement is active.

V3 (Pin 3): Third Monitor Input. This pin can be config-

ured as a single-ended input or the positive input for a

differential or remote diode temperature measurement (in

combination with V4). When configured for remote diode

temperature, this pin will source a current.

V4 (Pin 4): Fourth Monitor Input. This pin can be config-

ured as a single-ended input or the negative input for a

differential or remote diode temperature measurement (in

combination with V3). When configured for remote diode

temperature, this pin will have an internal termination,

while the measurement is active.

GND (Pin 5): Device Circuit Ground. Connect this pin to a

ground plane through a low impedance connection.

SDA (Pin 6): Serial Bus Data Input and Output. In the

transmitter mode (Read), the conversion result is output

through the SDA pin, while in the receiver mode (Write),

the device configuration bits are input through the SDA

pin. At data input mode, the pin is high impedance; while

at data output mode, it is an open-drain N-channel driver

and therefore an external pull-up resistor or current

source to VCC is needed.

SCL (Pin 7): Serial Bus Clock Input. The LTC2990 can

only act as a slave and the SCL pin only accepts exter-

nal serial clock. The LTC2990 does not implement clock

stretching.

ADR0 (Pin 8): Serial Bus Address Control Input. The

ADR0 pin is an address control bit for the device I2C

address. See Table 2.

ADR1 (Pin 9): Serial Bus Address Control Input. The

ADR1 pin is an address control bit for the device I2C

address. See Table 2.

VCC (Pin 10): Supply Voltage Input.

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