Datasheet LTC2991 (Analog Devices) - 8

LTC2991
PIN FUNCTIONS V1 (Pin 1):
First Monitor Input. This pin can be configured
V7 (Pin 7):
Seventh Monitor Input. This pin can be as a single-ended input (0V to 4.9V) or the positive input configured as a single-ended input (0V to 4.9V) or the for a differential or remote diode temperature measurement positive input for a differential or remote diode tempera- (in combination with V2). Differential common mode range ture measurement (in combination with V8). Differential is 0V to VCC, ±300mV differential. When configured for common mode range is 0V to VCC, ±300mV differential. remote diode temperature, this pin will source a current. When configured for remote diode temperature, this pin
V2 (Pin 2):
Second Monitor Input. This pin can be config- will source a current. ured as a single-ended input (0V to 4.9V) or the negative
V8 (Pin 8):
Eighth Monitor Input. This pin can be configured input for a differential or remote diode temperature mea- as a single-ended input (0V to 4.9V) or the negative input surement (in combination with V1). Differential common for a differential or remote diode temperature measurement mode range is 0V to VCC, ±300mV differential. When (in combination with V7). Differential common mode range configured for remote diode temperature, this pin will have is 0V to VCC, ±300mV differential. When configured for an internal termination, while the measurement is active. remote diode temperature, this pin will have an internal
V3 (Pin 3):
Third Monitor Input. This pin can be configured termination, while the measurement is active. as a single-ended input (0V to 4.9V) or the positive input
GND (Pin 9):
Device Ground. Connect this pin through a for a differential or remote diode temperature measurement low impedance connection to system ground. (in combination with V4). Differential common mode range
SDA (Pin 10):
Serial Bus Data Input and Output. In the is 0V to VCC, ±300mV differential. When configured for transmitter mode (read), the conversion result is output remote diode temperature, this pin will source a current. through the SDA pin, while in the receiver mode (write),
V4 (Pin 4):
Fourth Monitor Input. This pin can be configured the device configuration bits are input through the SDA as a single-ended input (0V to 4.9V) or the negative input pin. At data input mode, the pin is high impedance; while for a differential or remote diode temperature measurement at data output mode, it is an open-drain N-channel driver (in combination with V3). Differential common mode range and, therefore, an external pull-up resistor or current is 0V to VCC, ±300mV differential. When configured for source to VCC is needed. remote diode temperature, this pin will have an internal
SCL (Pin 11):
Serial Bus Clock Input of the I2C Interface. termination, while the measurement is active. The LTC2991 can only act as a slave and the SCL pin
V5 (Pin 5):
Fifth Monitor Input. This pin can be configured only accepts external serial clock. The LTC2991 does not as a single-ended input (0V to 4.9V) or the positive input implement clock stretching. for a differential or remote diode temperature measurement
PWM (Pin 12):
PWM Output. The PWM pin provides a (in combination with V6). Differential common mode range CMOS output level with a duty cycle proportional to the is 0V to VCC, ±300mV differential. When configured for remote diode temperature of the sensor connected to remote diode temperature, this pin will source a current. pins V7 and V8.
V6 (Pin 6):
Sixth Monitor Input. This pin can be configured
ADR0, ADR1, ADR2 (Pins 13, 14, 15):
Serial Bus Address as a single-ended input (0V to 4.9V) or the negative input Control Input. The ADR pins are address control bits for for a differential or remote diode temperature measurement the device I2C address. See Table 1. (in combination with V5). Differential common mode range is 0V to VCC, ±300mV differential. When configured for
VCC (Pin 16):
Chip Power. Connect to 2.9V to 5.5V low remote diode temperature, this pin will have an internal noise supply. A 0.1µF decoupling capacitor to GND is termination, while the measurement is active. required for this pin. 2991ff 8 For more information www.linear.com/LTC2991 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Timing Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts