Multi-mode sensing operations - Sensing modes for resistance, and capacitance
Power control (LDO) - Embedded power control for sensors
Low power consumption - Less than 4 mW
Temperature circuit - Factory calibration is required to use as an absolute thermometer. If not, it can be used as a relative thermometer.
Simplified Schematic
Figure 1. RSC103 1-channel simplified schematic
Figure 2. RSC103 4-channel simplified schematic
2. Applications
Sensor Readout IC
Home appliances
Automotive equipment parts
Industry/office ventilation systems
IoT devices
3. Description
3.1 Device information
The RSC103 is a readout-IC (ROIC) which have resistance sensing and capacitance sensing mode operations for various sensor applications. RSC103 has one input channel (Resistance or Capacitance) or four input channels (Resistance or Capacitance) to cooperate with multiple sensors.
It can use 4 channel but User should choice type of sensing (Resistance or Capacitance).
Part number
Package
Body size (mm)
RSC103 1-CH
QFN (20)
3.50 x 3.50
RSC103 4-CH
QFN (20)
3.50 x 3.50
3.2 Functional block diagram of RSC103
Figure 3. Functional block diagram
3.3 Operation diagram of RSC103
Figure 4. Relationship between Digital output and two Oscillator's frequency
External supply voltage of I2C
( Typical = 1.8 V )
SDA
2
I/O
SDA (I2C)
SCL
3
I/O
SCL (I2C)
R_SEN_1
4
I/O
Pin for 1-CH Sensing Resistor
C_SEN_1
5
P
Pin for 1-CH Sensing Capacitor
R_SEN_2
6
I/O
Pin for 2-CH Sensing Resistor
C_SEN_2
7
I/O
Pin for 2-CH Sensing Capacitor
C_REF
8
I/O
Pin for Reference Capacitor
C_SEN_3
9
P
Pin for 3-CH Sensing Capacitor
R_SEN_3
10
I/O
Pin for 3-CH Sensing Resistor
VDD_OSC
11
P
External supply voltage of Oscillator
( Typical = 1.8 V )
C_SEN_4
12
I/O
Pin for 4-CH Sensing Capacitor
R_SEN_4
13
I/O
Pin for 4-CH Sensing Resistor
VOUTA_1
14
I/O
LDO Output
VDD_BGR
15
P
External supply voltage of BGR
( Typical = 1.8 V )
VOUTA_2
16
I/O
LDO Output
VDD_DAC
17
P
External supply voltage of DAC
( Typical = 1.8 V )
CLK
18 (Option)
I/O
External CLK for OTP
VPPVDD
19
P
External supply voltage of Digital
( Typical = 1.8 V )
VPP6P5
20
P
External supply voltage of OTP
( Typical = 6.5 V )
PKG_GND
Package GND
GND
Ground
5. Specifications
INPUT Signal type - Resistance or Capacitance
Items
Unit
Min.
Typ.
Max.
Sensing resistance
K-ohm
1
---
10,000
Sensing capacitance
pF
1
---
50
Heater power control range
V
0.9
---
1.65
Current consumption
mA
7.11
7.16
7.22
5.1 Absolute maximum ratings 1)
Symbol
Description
Unit
Min.
Max.
VCCA
Supply voltage range
V
0
1.96
Io 2)
Continuous current through VCCA or GND
mA
0
2.5
ESD
Human body model
V
N/A
N/A
ESD
Machine model
V
N/A
N/A
ESD
Charged device model
V
N/A
N/A
1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions are not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
2) The maximum current is determined as one-channel is activated with the maximum supply voltage.
5.2 Recommended operating conditions
Temperature = 27 ℃
Symbol
Description
Unit
Min.
Max.
VCCA
Supply voltage range
V
1.62
1.96
5.3 Typical characteristics
5.3.1 Measurement result of Resistance value (Temperature condition = 30 ℃)
Figure 8. Measurement result of Resistance value
5.3.2 Measurement result of Resistance resolution
Figure 9. Measurement result of Resistance resolution
5.3.3 Measurement result of Capacitance
Figure 10. Measurement result of Capacitance
5.3.4 Example result of Humidity sensor (Capacitance type)
Test condition = 30 ℃
Figure 11. Example result of Humidity sensor
5.3.5 Measurement result of LDO
Figure 12. Measurement result of LDO
Figure 13. LDO output voltage
6. Application guidance
The RSC103 can process the various types of the signal in the form of resistance, and capacitance. Thus, the external elements of the ROIC are changed depending on the sensing modes.
Resistance / Capacitance sensing
The RSC103 has the tunable oscillator circuits depending on the external sensing Resistance and capacitance. Below the equation is basic equation of RSC103. Using this equation, user can calculate resistance value or capacitance value.
Basic equation of operation RSC103
Rref [Ohm] : Reference resistance
Cref [Farad] : Reference capacitance
Rsens [Ohm] : Sensing resistance (Or same value of reference resistor when RSC senses capacitance)
Csens [Farad] : Sensing capacitance (Or same value of reference capacitor when RSC senses resistance)
N : Register setting value ( This value decides counting window time )
M : Number of counting
Example of Software
When fill the blank of Rref, Cref, Csens, user can get a Rsens value.
When fill the blank of Rref, Cref, Csens, user can get a Rsens value.
