LAPIS Semiconductor ML610472, User Manual

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ML610471/472/473/Q471/Q472/Q473 User's Manual
Appendix C Electrical Characteristics
Appendix C-11
Condition for V
DD
=1.25 to 3.6V
(V
DD
=1.25 to 3.6V, V
SS
=0V, Ta=-20 to +70°C, Ta=-40 to +85°C for P version, unless otherwise specified)
Rating
Parameter Symbol Condition
Min. Typ. Max.
Unit
Oscillation resistor RS1,RT1
CS1
≥
740pF
1 ― ―
k
Ω
f
OSC1
Resistor for oscillation=6k
Ω 81.93 93.16 101.2 kHz
f
OSC2
Resistor for oscillation=15k
Ω
35.32 38.75 41.48 kHz
Oscillation frequency
V
DD
= 1.5V
f
OSC3
Resistor for oscillation=105k
Ω
5.22 5.65 6.03 kHz
Kf1 RT1=1k
Ω
2.139 2.381 2.632
⎯
Kf2 RT1=10k
Ω
0.973 1 1.028
⎯
RS to RT oscillation
frequency ratio
*1
V
DD
= 1.5V
Kf3 RT1=100k
Ω
0.142 0.147 0.152
⎯
f
OSC1
Resistor for oscillation=6k
Ω
85.28 94.58 103.3 kHz
f
OSC2
Resistor for oscillation=15k
Ω
35.72 38.87 41.78 kHz
Oscillation frequency
V
DD
= 3.0V
f
OSC3
Resistor for oscillation=105k
Ω
5.189 5.622 6.012 kHz
Kf1
RT1=1k
Ω
2.227 2.432 2.626
⎯
Kf2
RT1=10k
Ω
0.982 1 1.018
⎯
RS to RT oscillation
frequency ratio
*1
V
DD
= 3.0V
Kf3 RT1=100k
Ω
0.141 0.145 0.149
⎯
*
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.
f
OSCX
(RT1-CS1 oscillation)
Kfx =
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 IN1 pin),
including CVR1. Especially, do not have long wiring between IN1 and 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 RT1 (Thermistor and etc.) requires long wiring due to the restricted placement, please have V
SS
(GND) trace next to the signal.
･
Please make wiring to components (capacitor, resistor, and so on) necessary for objective measurement. Wiring to reserved components may
affect to the A/D conversion operation by noise the components itself may have.
RT1: 1k
Ω
/10k
Ω
/100k
Ω
RA1: 5k Ω
RS1: 15k
Ω
CS1: 560pF
CVR1: 820pF
Frequency measurement (f
OSCX
)
Input pin
*1: Input logic circuit to determine the
specified measuring conditions.
(*1)
V
DD
V
DDL
C
L
V
SS
C
V
RCM
VIH
VIL
IN1 CS1 RS1 RT1
CS1 RS1
CVR1
RA1
RT
1