29 eleCTRiCal ChaRaCTeRiSTiCS
29-12
Seiko epson Corporation
S1C17624/604/622/602/621 TeChniCal Manual
a/D converter current consumption-voltage characteristic
A
IN
= AV
DD
/2V, Ta = 25
°
C, Typ. value
1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8
220
200
180
160
140
120
100
80
60
40
20
0
V
DD
= AV
DD
[V]
I
ADC
[
µ
A]
Sampling rate = 100 ksps
Sampling rate = 0.8 ksps
R/F Converter Characteristics
29.11
analog characteristics
Unless otherwise specified: V
DD
= 1.8 to 3.6V, V
SS
= 0V, Ta = -25 to 70
°
C
item
Symbol
Condition
Min.
Typ.
Max.
unit
Reference and sensor oscillation
frequency
*
1
f
RFCLK
1
4000
kHz
Reference and sensor oscillation
frequency IC deviation
*
2
D
f
RFCLK
/
D
IC Resistive sensor DC/AC
oscillation mode
V
DD
= 3.6V
-25
25
%
V
DD
= 1.8V
-40
40
%
Capacitive sensor DC
oscillation mode
V
DD
= 3.6V
-25
25
%
V
DD
= 1.8V
-50
50
%
Reference resistor and resistive sensor
resistance
*
3
R
REF
, R
SEN
Resistive sensor DC/Capacitive sensor
DC oscillation mode
1
k
W
Resistive sensor AC oscillation mode
10
k
W
Reference capacitor and capacitive
sensor capacitance
*
3
C
REF
, C
SEN
Resistive sensor DC/AC oscillation mode
100
pF
Capacitive sensor DC oscillation mode
100
2000
pF
Time base counter clock frequency
f
TCCLK
8.2
MHz
RFIN pin high level Schmitt input voltage V
T+
0.5•V
DD
0.9•V
DD
V
RFIN pin low level Schmitt input voltage V
T-
0.1•V
DD
0.5•V
DD
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-
RFC reference/sensor oscillation frequency-
resistance characteristic
capacitance characteristic
(Resistive sensor DC/aC oscillation mode)
(Capacitive sensor DC oscillation mode)
C
REF
/C
SEN
= 1000pF, Ta = 25°C, Typ. value
R
REF
/R
SEN
= 100k
W
, Ta = 25°C, Typ. value
0
10000
1000
100
10
1
0
1
10
100
1000
10000
R
REF
/R
SEN
[k
W
]
f
RFCLK
[kHz]
V
DD
= 3.6 V
V
DD
= 1.8 V
IC deviation
10
100
1000
10000
1000
100
10
1
0
C
REF
/C
SEN
[pF]
f
RFCLK
[kHz]
V
DD
= 3.6 V
V
DD
= 1.8 V
IC deviation