TMPSNSRD-TCPL1 Microchip Technology, TMPSNSRD-TCPL1 Datasheet - Page 10

• Manufacturer Part Number: TMPSNSRD-TCPL1
• Description: BOARD RTD REFERENCE DESIGN
• Manufacturer: Microchip Technology

Specifications of TMPSNSRD-TCPL1

• Sensor Type: Temperature, Thermocouple
• Embedded: No
• Utilized Ic / Part: MCP3421, MCP9804
• Processor To Be Evaluated: MCP9804, MCP3421
• Interface Type: USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Interface: -
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Voltage and Current Measurment Using
Delta-Sigma ADCs
The MCP342X family devices are easy-to-use high precision
delta sigma ADC devices from Microchip. These devices have
an internal reference (2.048V) with a user programmable
PGA (x1, x2, x4, x8). The ADC resolution is programmable as
12-bit, 14-bit, 16-bit or 18-bit by the user.
This ADC family offers single, dual and four differential
input channels. Because of its simplicity and low price, this
device family can be used for various applications from
simple voltage and current measurement to high precision
temperature measurement.
Voltage Measurement Using MCP3421 Device
10
Delta-Sigma ADCs
Current Measurement Using MCP3421 Device
Battery
Current = (Measured Voltage)/(Known Resistance Value of Current Sensor)
Direction of current is determined by sign bit (MSB bit) of the ADC output code.
Signal Chain Design Guide
Charging
Current
V
V Measured = ADC Output Codes ● LSB ●
LSB = ________________
LSB of 18-bit ADC = ________________ = ______ = 15.625 μV
V
IN
BAT
=
(
________
Reference Voltage
R1 + R2
Current Sensor
R2
+
MCU
(a) If V
ADC
2
N
–
–1
)
REF
●
MCP3421
R
R
(
Reference Voltage
1
2
< V
V
BAT
BAT
Discharging
Current
)
To Load
2
+
–
N
–1
ADC
MCU
MCP3421
_________ ● _____
(R1 + R2)
2.048V
V
BAT
2
Wireless Temperature Monitoring Solution
MCP3422 Analog-to-Digital Converter (ADC) Feature Summary
R2
17
Bit Resolution
Number of Differential Input
Channels
Internal Programmable Gain
Amplifier
INL Error (Typical)
Offset Error (Typical)
Internal Reference Voltage
Output Noise (Typical)
Gain Error (Typical)
Interface
(Thermocouple)
Heat
(b) If V
PGA
1
REF
Temp Sensor
> V
MCP9804
±1°C
BAT
+
–
18 bits (User can select 18-, 16-,
14- or 12-bit options)
2
x1, x2, x4 or x8 (user option)
10 PPM of full scale range
15 μV
2.048V
1.5 μVrms
0.05% of full scale range
I
ADC
MCU
2
C™
18-bit ∆
+
–
MCP3421
MCP3421
∑
ADC
MRF24J40
PIC
®
MCU
2.4 GHz