FS98O24 datasheet(28/77 Pages) FORTUNE

Part #	FS98O24

Description	8-bit MCU with 4k program EPROM, 256-byte RAM

PDF	77 Pages

Scroll/Zoom	100%

Manufacturer	FORTUNE [Fortune Semiconductor Corp.]

Direct Link	https://www.ic-fortune.com/eng/index.asp

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28 / 77 page

4.1. Voltage Doubler

Figure 4-2 Voltage Doubler

Voltage Doubler is used for generating VGG which provide input4 for VDDA Voltage Regulator. The inputs of

Voltage Doubler are VDDP, VSSP, CA and CB. The related registers are S_PCK, PUMPCK and ENPUMP. The

Output is VGG. Please see Figure 4-2.

Table 4-2 Voltage Doubler register table

Address Name

Bit 7

Bit 6

Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on Power on Reset

32H

NETJ ENPUMP PUMPCK

S_PCK

00000000

Operations:

Connect the pins VDDP and VSSP to VDD (2.2V~3.6V) and VSS (system ground).

Put a 10uF capacitance between CA and CB.

Select the Voltage Doubler Operation frequency by setting S_PCK and PUMPCK according to the

following table

Set the ENPUMP flag.

The output, VGG, will be two times of VDDP.

4 Please refer to Section 4.2 for detailed description about VDDA and Voltage regulator.

Voltage Doubler

ENPUMP

S_PCK

10uF

1uF

PUMPCK

10uF

ENPUMP=0

FS98O24 Datasheet(PDF) 28 Page - Fortune Semiconductor Corp.