GPCD9002A

© Generalplus Technology Inc.

Proprietary & Confidential

21

Apr. 11, 2017

Version: 1.2

8.5. GPCD9002A Application Circuit with IO Heavy Loading(1): High Sourcing

Reset

RESETB

VSSB

0.1u

C5

VSS_REG

VDD_REG

VDDB

VDD33

VDD_1~2

2.2u

C2

XO

XI

VSSB

IOB0~7

IOB0~7

IOA0

VDD_IO1

VSS_1~3

47u

C1

0.1u

C3

VDD_DAC1

10u

C4

VSS_DAC1~2

AUDN

AUDP

VDDB

VSSB

VDD_IO2

(Battery Power)

20p

VSSB

*C6

12MHz

20p

*C7

VDD_DAC2

22u

C8

VSS_DAC3

VDDB

VSSB

10

Ω

R1

Note:

1. 4

Ω speaker application is not allowed in GPCD9002A.

2. For system stability and performance, it is recommended to add R1/C8 for the

applications that IOs toggle with high current sourcing, such as LEDs or motor drivers.

3. The value of R2~R9/C8 depends on applications. Basically, the more IO toggles, the larger

C8 is suggested.

4. The values of C6/C7 are for design guidance only, different values may be needed for different

crystal/resonator used.

IOA1

IOA2

IOA3

IOA4

IOA5

IOA6

IOA7

VSSB

8

Ω SPEAKER

R2

R3

R4

R5

R6

R7

R8

R9

IOC0~7

IOD0~7

IOC0~7

IOD0~7

ROM

ADDRESS

/CE

/OE

DATA

XA0~21

MEMCSB

MEMOEB

XD0~7

VDD_MEM

VSS_MEM