LC79451KB

No.A2223-25/38

7-2. Control Register

(1) Control Register 1 (Charge-pump Control)

Address : F0

D7

D6

D5

D4

D3

D2

D1

D0

CP_F21

CP_F20

CP_F12

CP_F11

CP_F10

CP_T2

CP_T1

CP_T0

(1)

(1)

(0)

(0)

(0)

(1)

(1)

(0)

( ) default

1) CP_T0 to T2

⋅⋅⋅ Charge-pump rising period

Notice : Charge-pump rising period can shorten by capacity value connected outside, electric charge stored to

capacitor, VDD2 power supply voltage, and charge-pump reference voltage. But, please evaluate the

module when you change a default value of charge-pump rising period or recommended capacity value.

In addition, please confirm that charge-pump rising period is enough.

When conditions of use are not met, and select “all at once” of charge-pump voltage generation, this

device may be destroyed.

2) CP_F10 to F12

⋅⋅⋅ Charge-pump frequency of waveform output standby period

3) CP_F20 to F21

⋅⋅⋅ Charge-pump frequency of waveform output period

CP_T2

CP_T1

CP_T0

Charge-pump rising

period

Charge-pump voltage

generation order

Use condition

0

0

0

2ms

0

0

1

4ms

0

1

0

8ms

0

1

1

16ms

VOUT0 to VOUT3

all at once

VOUT2 ≥ +12V

VOUT3 ≤ -12V

1

0

0

16ms

-

1

0

1

32ms

-

1

1

0

64ms

-

1

1

1

128ms

VOUT0 to VOUT3

in turn

-

CP_F12

CP_F11

CP_F10

Frequency

0

0

0

1kHz

0

0

1

2kHz

0

1

0

Stop *1

0

1

1

Stop *1

1

0

0

4kHz

1

0

1

8kHz

1

1

0

16kHz

1

1

1

32kHz

CP_F21

CP_F20

Frequency

0

0

4kHz

0

1

8kHz

1

0

16kHz

1

1

32kHz

(default)

(default)

(default)

*1) Cf. 10 - 2