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29 eleCTRiCal ChaRaCTeRiSTiCS
a/D converter current consumption-voltage characteristic
A
= AV
/2V, Ta = 25°C, Typ. value
IN
DD
29.11
R/F Converter Characteristics
analog characteristics
Unless otherwise specified: V
DD
item
Reference and sensor oscillation
*1
frequency
Reference and sensor oscillation
*2
frequency IC deviation
Reference resistor and resistive sensor
*3
resistance
Reference capacitor and capacitive
*3
sensor capacitance
Time base counter clock frequency
RFIN pin high level Schmitt input voltage V
RFIN pin low level Schmitt input voltage V
*1 The oscillation frequency/IC deviation characteristic value may increase due to variations in oscillation frequency caused by leak-
age if the oscillation frequency is 1 kHz or lower.
*2 In these characteristics, unevenness between production lots, and variations in board, resistances and capacitances used in the
measurement environment are taken into account (variations in temperature are not included).
*3 The CR oscillation can be performed if the resistance or capacitance is out of the range shown in the table (see characteristic
curves), note, however, that the oscillation frequency/IC deviation characteristic value may increase due to parasitic elements on
the board and those in the IC.
RFC reference/sensor oscillation frequency-
resistance characteristic
(Resistive sensor DC/aC oscillation mode)
C
/C
= 1000pF, Ta = 25°C, Typ. value
REF
SEN
10000
1000
IC deviation
100
10
1
0
0
1
10
R
/R
REF
29-12
220
200
180
160
Sampling rate = 100 ksps
140
120
100
80
60
40
20
0
1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8
V
DD
= 1.8 to 3.6V, V
= 0V, Ta = -25 to 70°C
SS
Symbol
f
RFCLK
Df
/DIC Resistive sensor DC/AC
RFCLK
oscillation mode
Capacitive sensor DC
oscillation mode
R
, R
Resistive sensor DC/Capacitive sensor
REF
SEN
DC oscillation mode
Resistive sensor AC oscillation mode
C
, C
Resistive sensor DC/AC oscillation mode
REF
SEN
Capacitive sensor DC oscillation mode
f
TCCLK
T+
T-
V
= 1.8 V
DD
V
= 3.6 V
DD
100
1000
10000
[kW]
SEN
Seiko epson Corporation
Sampling rate = 0.8 ksps
= AV
[V]
DD
Condition
V
= 3.6V
DD
V
= 1.8V
DD
V
= 3.6V
DD
V
= 1.8V
DD
RFC reference/sensor oscillation frequency-
capacitance characteristic
(Capacitive sensor DC oscillation mode)
R
/R
= 100kW, Ta = 25°C, Typ. value
REF
SEN
1000
100
10
1
0
10
S1C17624/604/622/602/621 TeChniCal Manual
Min.
Typ.
Max.
1
4000
-25
25
-40
40
-25
25
-50
50
1
10
100
100
2000
8.2
0.5•V
0.9•V
DD
0.1•V
0.5•V
DD
IC deviation
V
= 1.8 V
DD
V
= 3.6 V
DD
100
1000
C
/C
[pF]
REF
SEN
unit
kHz
%
%
%
%
kW
kW
pF
pF
MHz
V
DD
V
DD
10000
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