Datasheet
Table Of Contents
- 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
LTC2991
20
2991fd
For more information www.linear.com/LTC2991
applicaTions inForMaTion
Table 6. V5, V6 and V7, V8 CONTROL (07h) Register (Default 00h)
BIT NAME OPERATION
b7 V7, V8 Filt 1 = Filter Enabled, 0 = Filter Disabled for V7 and V8, V7 – V8 or T4 (Default)
b6 T
R4
Kelvin 1 = Kelvin, 0 = Celsius for T4 (Default)
b5 V7, V8 Temperature 1 = Temperature, 0 = Voltage (Per b4 Setting) (Default)
b4 V7, V8 Differential 1 = Differential (V7 – V8) and V7 Single-Ended
0 = Single-Ended Voltage (V7 and V8) (Default)
b3 V5, V6 Filt 1= Filter Enabled, 0 = Filter Disabled for V5 and V6, V5 – V6 or T3 (Default)
b2 T
R3
Kelvin 1 = Kelvin, 0 = Celsius for T3 (Default)
b1 V5, V6 Temperature 1 = Temperature, 0 = Voltage (Per b0 Setting) (Default)
b0 V5, V6 Differential 1 = Differential (V5 – V6) and V5 Single-Ended
0 = Single-Ended Voltage (V5 and V6) (Default)
Table 7. PWM, V
CC
and T
INTERNAL
CONTROL (08h) Register (Default 00h)
BIT NAME OPERATION
b7 PWM[0] PWM Threshold Least Significant Bit (Default = 0)
b6 PWM Invert* 1 = PWM Inverted, 0 = PWM Noninverted (Default)
b5 PWM Enable** 1 = PWM Enabled, 0 = PWM Disabled (Default)
b4 Repeated Acquisition 1 = Repeated Mode
0 = Single Shot (Default)
b3 T
INTERNAL
Filt 1 = Filter Enabled for T
INTERNAL
0 = Filter Disabled T
INTERNAL
(Default)
b2 T
INTERNAL
Kelvin 1 = Kelvin, 0 = Celsius for T
INTERNAL
(Default)
b1 Reserved Reserved
b0 Reserved Reserved
* Noninverted would be an increasing duty cycle for an increasing temperature.
** If disabled and noninverted, the PWM pin will be a logic level 0. If disabled and inverted, the PWM pin will be a logic level 1.
Table 8. PWM Register Format (Default 00h)
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
D8 D7 D6 D5 D4 D3 D2 D1
Note: D0 is located in the MSB of PWM, V
CC
and T
INTERNAL
CONTROL (08h) Register
Table 9. Voltage/Current Measurement MSB Data Register Format
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
DV* Sign D13 D12 D11 D10 D9 D8
*Data valid is set when a new result is written into the register. Data valid is cleared
when this register is addressed (read) by the I
2
C interface.
Table 10. Voltage/Current Measurement LSB Data Register Format
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
D7 D6 D5 D4 D3 D2 D1 D0