CS4121EDWFR20 View Datasheet(PDF) - ON Semiconductor

Part Name

Description

MFG CO.

CS4121EDWFR20

Low Voltage Precision Air-Core Tach/Speedo Driver

ON Semiconductor 

CS4121

VREG

R3

VC(t)

+

−

FREQIN

SQOUT

CCP

R4

+

QSQUARE

−

2.0 V

0.25 V

CP+

Q1

2.0 V

+

F/VOUT

CP−

Q3

−

RT

F to V

C4

Q2

Figure 7. Partial Schematic of Input and Charge Pump

FREQIN 0

SQOUT

0

VCC

tDCHG

VREG

T

tCHG

ICP+

VCP+

0

600 mV

−0.3 V

Figure 8. Timing Diagram of FREQIN and ICP

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