Advertisement
23.14. 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
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
VDD
3.6 V
1.8 V
100
10
1
0.1
1
10
R
REF
23-18
= 1.8 to 3.6 V, V
= 0 V, Ta = -40 to 85 °C
SS
Symbol
f
RFCLK
Ta = 25 °C *1
Df
DIC
RFCLK/
R
R
REF,
SEN
C
REF
f
TCCLK
V
T+
V
T-
DV
T
I
CREF = 1,000 pF, RREF/RSEN = 100
RFC
kW, Ta = 25 °C, VDD = 3.6 V
1/f
RFCLK
V
T+
V
T-
∆f
/∆IC
RFCLK
100
1,000
10,000
[kΩ]
/R
SEN
Seiko Epson Corporation
Condition
Min.
1
-40
10
100
–
0.5 × V
0.2 × V
120
–
1/f
V
T+
V
T-
RFC reference/sensor oscillation frequency-
capacitance characteristic
R
/R
= 100 kW, Ta = 25 °C, Typ. value
REF
SEN
1,000
VDD
3.6 V
1.8 V
100
10
1
0.1
10
100
C
Typ.
Max.
Unit
–
1,000
kHz
–
40
%
–
-
kW
–
–
pF
–
4.2
MHz
–
0.8 × V
DD
DD
–
0.5 × V
DD
DD
–
–
mV
200
350
µA
RFCLK
V
T+
∆f
/∆IC
RFCLK
1,000
10,000
100,000
[pF]
REF
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
V
V
Advertisement
