Rainbow-electronics DS2715 Manual de usuario descargar pdf (Pagina 5)

DS2715: NiMH Cell Pack Charge Controller

5 of 12

Figure 1. BLOCK DIAGRAM

State Machine

Charge

Timer

Regulator

LED1

VDD

LED2

UVLO

Oscillator

+

-

Pre-Charge

Low Cells

Fast Charge

Exit on Full

Or Timeout

25% Top-Off Charge

(Set by Timer)

SNS+

R

E

F

Vbatt

THM

Rt

Cbias

Mode

Vch

DS2715

Rt start-up test

+

-

Disch. Detect

Ref

HV

HV

HV

Done, Waiting for event

to start charging

Pwr

Pwr

Vsns

Ref

121mV,

33mV,

10mV

AMP

or

Comp

@-0.01V

Rt

A

D

C

RS Latch

Latch is set until

Vsns negative WRT Vss

+

-

R

Th

Disable during

discharge

Div

SNS-

VSS

VSS

V

UVLO

Ref

M

U

X

SNS+

Ref

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