Rohm LAPIS SEMICONDUCTOR ML620Q503, User Manual

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ML620Q503/Q504 User’s manual
Appendix C Electrical Characteristics
FEUL620Q504 C-5
●AC characteristics (RC-ADC)
(V
DD
=1.8~3.6V, V
SS
=0V, Ta=-40~+85
°
C, unless otherwise specified)
Parameter Symbol Condition
Rating
unit
Min. Typ. Max.
Resister for oscillation
RS0,RS1,RT0
,RT0-1,RT1
– 1 – 400 k
Ω
Oscillation freqency
V
DD
= 3.0V
CVR=820pF
CS=560pF
f
OSC1_0
Resister for oscillation
=1k
Ω
– 528 – kHz
f
OSC2_0
Resister for oscillation
=10k
Ω
– 59 – kHz
f
OSC3_0
Resister for oscillation
=100k
Ω
– 5.9 – kHz
RS to RT oscillation
frequency ratio *
1
V
DD
= 3.0V
CVR=820pF
CS=560pF
Kf1_0 RT0, RT0-1, RT1=1k
Ω
8.225 8.94 9.655 –
Kf2_0 RT0, RT0-1, RT1=10k
Ω
0.99 1 1.01 –
Kf3_0 RT0, RT0-1, RT1=100k
Ω
0.093 0.101 0.109 –
*
1
：
Kfx is the ratio of the oscillation frequency by the sensor resistor to the oscillation frequency by the reference resistor on
the same conditions.
Kfx =
f
OSCX
(RT0-CS0 oscillation) f
OSCX
(RT0-1-CS0 oscillation) f
OSCX
(RT1-CS1 oscillation)
f
OSCX
(RS0-CS0 oscillation) , f
OSCX
(RS0-CS0 oscillation) , f
OSCX
(RS1-CS1 oscillation)
( x = 1, 2, 3 )
Measuring circuit
【
Note
】
・
Please have the shortest layout for the common node (wiring patterns which are connected to the external capacitors, resistors
and IN0/IN1 pin), including CVR0/CVR1. Especially, do not have long wire between IN0/IN1 and RS0/RS1. The coupling
capacitance on the wires may occur incorrect A/D conversion. Also, please do not have signals which may be a source of noise
around the node.
・
When RT0/RT1 (Thermistor and etc.) requires long wiring due to the restricted placement, please shield the signal by
V
SS
(GND).
・
Please make wiring to components (capacitor, resisteor and etc.) necessory for objective measurement. Wiring to reserved
components may affect to the A/D conversion operation by noise the components itself may have.
V
DD
V
REF
V
DDL
V
DDX
C
L1
C
L0
C
X
V
SS
C
V
RT0, RT0-1, RT1: 1k
Ω/10kΩ/100kΩ
RS0, RS1: 10k
Ω
CS0, CT0, CS1: 560pF
CVR0, CVR1: 820pF
RCM
Measure frequency
(f
OSCX
)
Input
pi
n
s
VIH
VIL
(*1) Input logic circuit to determine the specified measuring conditions.
CS0 RT0 IN1 CS1 RS1 RT1
CS
0
RS0
RS
0
RCT0
R
T
0
-1
CT
0
RT
0
CS
1
RS
1
RT
1
IN0
CVR0 CVR1
(*1)