SM8702AM datasheet(15/16 Pages) NPC

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SM8702AM

NIPPON PRECISION CIRCUITS—15

I2C Bus Data Bytes

Byte 0: function and frequency select

Byte 1: CPU register

Byte 2: PCI register

Bit

Function

P o w e r-ON

default

Notes

0: Spread spectrum ± 1.5% modulation

1: Spread spectrum ± 0.5% modulation

The spread spectrum accuracy of modulation is not

guaranteed.

6:4

Frequency select bits

The pow er-ON default for bits 4 to 6 is 1.

When bit 3 is set to 1 (I2C select), bits 4 to 6 select

the frequency in the same write cycle timing.

0: Hardware frequency select using FS[0:2]

1: I2C bus serial data frequency select

FS[0:2] are latch inputs

0: Spread spectrum center spread select

1: Spread spectru m d own spread select

0: Nor mal operating mode (SSCG disabled)

1: Spread spectrum operating mode (SSCG enabled)

0: Nor mal output mode (running)

1: Three-state output mode

All outputs are high impedance when bit 0 is set to 1.

Bit 6

Bit 5

Bit 4

CPUCLK

[MHz]

PCICLK

[MHz]

100.2

33.4

1 3 3

33.2

112.1

37.3

1 0 3

34.3

66.5

33.2

83.3

41.6

74.9

37.4

94.7

31.6

Bit

n umber

P o w e r-ON

default1

1. 1 = enabled, 0 = disabled

Notes

2 6

48MHz USB

2 5

24MHz (Super I/O)

–

(Reser ved)

–

(Reser ved)

–

(Reser ved)

–

(Reser ved)

4 3

CPUCLK1 enab le

4 4

CPUCLK0 enab le

Bit

n umber

P o w e r-ON

default1

1. 1 = enabled, 0 = disabled

Notes

–

(Reser ved)

PCICLK_F enable

–

(Reser ved)

1 4

PCICLK4 enable

1 2

PCICLK3 enable

1 1

PCICLK2 enable

1 0

PCICLK1 enable

PCICLK0 enable

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