RSC103

4-Channel input Readout IC

1. Features

• 4-channel inputs

• I2C

• OTP - One Time Programmable Devices

• 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

3.4 Evaluation board schematic

Figure 5. Evaluation circuit board (Single channel)

Figure 6. Evaluation circuit board (Multi-channel)

4. Pin configuration and functions

4.1 QFN Package view

QFN Package bottom view

Figure 7. RSC103 1-channel (left) and RSC103 4-channel (right)

4.2 RSC103 1-channel Pin configurations

Pin functions - RSC103 1-channel Note : I=input, O=output, I/O=input and output, P=power supply, GND=ground

Name	Pin No.	I/O	Function
VOUTA	1	I/O	LDO Output
R_REF	2	I/O	Pin for Reference Resistor
R_SENS	3	I/O	Pin for Sensing Resistor
VDD_OSC	4	P	External supply voltage of Oscillator ( Typical = 1.8 V )
VDD_OSC	5 (Option)	P	External supply voltage of Oscillator ( Typical = 1.8 V )
C_SENS	6	I/O	Pin for Sensing Capacitor
TEST_CLK	7 (Option)	I/O	Test Pin
C_REF	8	I/O	Pin for Reference Capacitor
CLK	9 (Option)	I/O	External CLK for OTP
VDD_DIG	10	P	External supply voltage of Digital ( Typical = 1.8 V )
SCL	11	I/O	SCL ( I2C )
SDA	12	I/O	SDA ( I2C )
VPP6P5	13 (Option)	P	External supply voltage of OTP ( Typical = 6.5 V )
VPPVDD	14	P	External supply voltage of Digital ( Typical = 1.8 V )
VDD_BGR	15	P	External supply voltage of BGR ( Typical = 1.8 V )
VDD_BGR	16 (Option)	P	External supply voltage of BGR ( Typical = 1.8 V )
VDD_VGR	17 (Option)	P	External supply voltage of BGR ( Typical = 1.8 V )
N.C	18	---	---
VDD_DAC	19	P	External supply voltage of DAC ( Typical = 1.8 V )
VDD_DAC	20 (Option)	P	External supply voltage of DAC ( Typical = 1.8 V )
PKG_GND	Package GND	GND	Ground

4.3 RSC103 4-channel Pin configurations

Pin functions - RSC103 4-channel Note : I=input, O=output, I/O=input and output, P=power supply, GND=ground

Name	Pin No.	I/O	Function
VDD_I2C	1	I/O	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.

Figure 14. Example software

7. Resister maps

7.1 Single channel

RSC103 Single channel resister maps

24KB

RSC103V4_Register_map_Single_v0.xlsx

7.2 Multi channel

RSC103 Multi channel resister maps

26KB

RSC103V4_Register_map_Multi_v0.xlsx

Default setting	Single channel	Multi channel
0x00	000F	0187
0x01	0000	1000
0x02	5FFA	FFC2
0x03	5FFA	1C3F
ox04	7957	9E52
0x05	1200	B004
0x06	1262	0000

8. Package outline dimensions

Figure 15. Package front view

Figure 16. Package side view

Figure 17. Package bottom view

Quad-Flat Non-leaded package dimensions (Unit: mm)

Symbol	Min.	Typical	Max.
A	0.70	0.75	0.80
A1	0.00	0.02	0.05
A3	---	0.203	---
b	0.18	0.25	0.30
D	---	3.50	---
E	---	3.50	---
e	---	0.50	---
L	0.35	0.40	0.45
K	0.20	---	---
D2	1.95	2.00	2.05
E2	1.95	2.00	2.05

1MB

RSC103_Instruction Manual rev.0.1.pdf

pdf