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23.15 R/F Converter (RFC) Characteristics
R/F converter characteristics change depending on conditions (board pattern, components used, etc.). Use these
characteristic values as a reference and perform evaluation using the actual printed circuit board.
Unless otherwise specified: V
DD
Item
Reference/sensor oscillation frequency f
Reference/sensor oscillation frequency
IC deviation
Reference resistor/resistive sensor
resistance
Reference capacitance
Time base counter clock frequency
High level Schmitt input threshold
voltage
Low level Schmitt input threshold
voltage
Schmitt input hysteresis voltage
R/F converter operating current
*1 In this characteristic, unevenness between production lots, and variations in measurement board, resistances and capacitances
are taken into account.
Waveforms for external clock input mode
V
T+
RFINn
RFC reference/sensor oscillation frequency-
resistance characteristic
C
= 1,000 pF, Ta = 25 °C, Typ. value
REF
1,000
V
DD
5.5 V
3.6 V
100
1.8 V
10
1
0.1
1
10
R
REF
S1C31D41 TECHNICAL MANUAL
(Rev. 1.1)
= 1.8 to 5.5 V, V
= 0 V, Ta = -40 to 85 °C
SS
Symbol
RFCLK
DIC Ta = 25 °C
Df
RFCLK/
R
R
REF,
SEN
C
REF
f
TCCLK
V
T+
V
T-
DV
T
I
C
= 1,000 pF, R
RFC
REF
Ta = 25 °C, V
1/f
RFCLK
V
T+
V
T-
f
/ IC
RFCLK
100
1,000
10,000
/R
[k ]
SEN
Seiko Epson Corporation
23 ELECTRICAL CHARACTERISTICS
Condition
Min.
-40
*1
100
0.5 × V
0.2 × V
120
/R
= 100 kW,
REF
SEN
= 3.6 V
DD
V
T+
V
RFC reference/sensor oscillation frequency-
capacitance characteristic
R
/R
= 100 kW, Ta = 25 °C, Typ. value
REF
SEN
1,000
V
DD
5.5 V
100
3.6 V
1.8 V
10
1
0.1
10
100
Typ.
Max.
1
–
1,000
–
40
10
–
-
–
–
–
–
4.2
–
0.8 × V
DD
DD
–
0.5 × V
DD
DD
–
–
–
200
350
1/f
RFCLK
V
T+
T-
f
/ IC
RFCLK
1,000
10,000
100,000
C
[pF]
REF
Unit
kHz
%
kW
pF
MHz
V
V
mV
µA
23-17
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