R/F Converter (Rfc) Characteristics - Epson S1C17M20 Technical Manual

21 ELECTRICAL CHARACTERISTICS

21.12 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 R
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
10,000
1,000
V
DD
5.5 V
3.6 V
100
1.8 V
10
1
0
1 10
R
REF
21-12
= 1.8 to 5.5 V, V = 0 V, Ta = -40 to 85°C
SS
Symbol
f
RFCLK
DIC Ta = 25°C
Df
RFCLK/
R
REF, SEN
C
REF
f
TCCLK
V
T+
V
T-
DV
T
I C
RFC REF
R
REF
Ta = 25°C
1/f
RFCLK
V
T+
V
T-
∆f
/∆IC
RFCLK
100 1,000 10,000
/R [kΩ]
SEN
Seiko Epson Corporation
Condition V
DD
*1
= 1,000 pF, 3.6 to 5.5 V
/R = 100 kW,
1.8 to 3.6 V
SEN
V
T+
RFC reference/sensor oscillation frequency-
capacitance characteristic
R /R = 100 kW, Ta = 25°C, Typ. value
REF SEN
10,000
1,000
V
DD
5.5 V
100
3.6 V
1.8 V
10
1
0
10 100
Min. Typ. Max.
1 – 1,000
-40 – 40
10 – -
100 – –
– – 21
0.5 × V – 0.8 × V
DD DD
0.2 × V – 0.5 × V
DD DD
180 – –
– 130 200
– 60 85
1/f
RFCLK
V
T+
V
T-
∆f
/∆IC
RFCLK
1,000 10,000 100,000
C [pF]
REF
S1C17M20/M21/M22/M23/M24/M25
TECHNICAL MANUAL (Rev. 1.0)
Unit
kHz
%
kW
pF
MHz
V
V
mV
µA
µA