Rev. 6/27/01

SP66680 Evaluation Board Manual

© Copyright 2001 Sipex Corporation

3

changes with input changes. Also, you can see these mode changes by attaching a

scope probe to the “CF1P” post and observe how the pump waveform changes from the

2X mode to the 1.5X mode, as shown in the scope traces shown below. As seen in the

datasheet specification for Power Efficiency, by dynamically changing modes with input

voltages the SP6680 optimizes power efficiency.

Vin = 3.7V, 2X Mode 32kHz

Vin = 4.0V, 1.5X Mode 32kHz

TABLE2: SP6680UEB PIN ASSIGNMENTS

Ch1 = CF2P

Ch2 = CF1P

Ch3 = Vin

Ch4 = Vout

Pin No.

Pin Name

Pin Function

Input/Output Pin Name

U1 - SP6680UEB Pin Assignments

1

VOUT

PreRegulated 5.2 to 6.3Vout

VOUT

2

CFIP

Fly Capacitor One Positive

CFIP

3

VIN

Input Voltage

VIN

4

CD4

Digital Input for CLK/4

CD4

5

CX8

Digital Input for CLK*8

CX8

6

CLK

Clock Input

CLK

7

CF2N

Fly Capacitor Two Negative

8

GND

Ground

GND

9

CF1N

Fly Capacitor One Negative

10

CF2P

Fly Capacitor Two Positive

CF2P

U2 - SP6200EM5 Pin Assignments

1

VIN

LDO Input

2

GND

Ground

GND

3

ON/OFF_N

ON = H or Shutdown =L

4

N/C

No Connect

5

VOUT

+5V Output

+5V