LAPIS Semiconductor ML610421, User Manual, Page: 427 / 437

ML610Q421/ML610Q422/ML610421 User’s Manual
Appendix C Electrical Characteristics
C – 16

AC CHARACTERISTICS (RC Oscillation A/D Converter)
(V
DD
= 1.3 to 3.6V, AV
DD
= 2.2 to 3.6V, V
SS
= AV
SS
= 0V, Ta =
−
20 to +70
°
C, Ta =
−
40 to +85
°
C for P Version, unless
otherwise specified)
Parameter Symbol Condition
Rating
Uni
t
Min. Typ. Max.
Resistors for oscillation
RS0, RS1,
RT0,
RT0-1,RT1
CS0, CT0, CS1
≥
740pF 1
 
k
Ω
Oscillation frequency
VDD = 1.5V
f
OSC1
Resistor for oscillation = 1k
Ω
209.4 330.6 435.1 kHz
f
OSC2
Resistor for oscillation = 10k
Ω
41.29 55.27 64.16 kHz
f
OSC3
Resistor for oscillation = 100k
Ω
4.71 5.97 7.06 kHz
RS to RT oscillation frequency
ratio
*1
VDD = 1.5V
Kf1 RT0, RT0-1, RT1 = 1kHz 5.567 5.982 6.225

Kf2 RT0, RT0-1, RT1 = 10kHz 0.99 1 1.01

Kf3 RT0, RT0-1, RT1 = 100kHz 0.104 0.108 0.118

Oscillation frequency
VDD = 3.0V
f
OSC1
Resistor for oscillation = 1k
Ω
407.3 486.7 594.6 kHz
f
OSC2
Resistor for oscillation = 10k
Ω
49.76 59.28 72.76 kHz
f
OSC3
Resistor for oscillation = 100k
Ω
5.04 5.993 7.04 kHz
RS to RT oscillation frequency
ratio
*1
VDD = 3.0V
Kf1 RT0, RT0-1, RT1 = 1kHz 8.006 8.210 8.416

Kf2 RT0, RT0-1, RT1 = 10kHz 0.99 1 1.01

Kf3 RT0, RT0-1, RT1 = 100kHz 0.100 0.108 0.115

*
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)
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.
V
DD
AV
DD
V
REF
V
DDL
V
DDX
C
L1
C
L0
C
X
V
SS
AV
SS
C
V
RT0, RT0-1, RT1: 1k
Ω
/10k
Ω
/100k
Ω
RS0, RS1: 10k
Ω
CS0, CT0, CS1: 560pF
CVR0, CVR1: 820pF
RCM
Frequency measurement
(f
OSCX
)
Input
pi
n
s
VIH
VIL
*1: Input logic circuit to
determine the specified
measuring conditions.
(*1)
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