LC72131 datasheet(7/23 Pages) SANYO

7 / 23 page

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No. 4921-7/23

LC72131, 72131M

Pin No.

Symbol

(MFP pin Nos. are

Type

Functions

Circuit configuration

in parentheses.)

VSS

BO1

BO2

BO3

BO4

IO1

IO2

AIN

AOUT

IFIN

21 (19)

7 (6)

8 (7)

9 (8)

10 (9)

11 (10)

13 (12)

18 (16)

19 (17)

20 (18)

12 (11)

Ground

Output port

I/O port

Charge pump

output

LPF amplifier

transistor

IF counter

• The LC72131 ground

—

• Dedicated output pins

• The output states are determined by BO1 to BO4 bits in

the serial data.

Data: 0 = open, 1 = low

• A time base signal (8 Hz) can be output from the BO1

pin. (When the serial data TBC bit is set to 1.)

• Care is required when using the BO1 pin, since it has a

higher on impedance that the other output ports (pins

BO2 to BO4).

• All output ports are set to the open state following a

power on reset.

• I/O dual-use pins

• The direction (input or output) is determined by bits IOC1

and IOC2 in the serial data.

Data: 0 = input port, 1 = output port

• When specified for use as input ports:

The state of the input pin is transmitted to the controller

over the DO pin.

Input state: low = 0 data value

high = 1 data value

• When specified for use as output ports:

The output states are determined by the IO1 and IO2

bits in the serial data.

Data: 0 = open, 1 = low

• These pins function as input pins following a power on

reset.

• PLL charge pump output

When the frequency generated by dividing the local

oscillator frequency by N is higher than the reference

frequency, a high level is output from the PD pin.

Similarly, when that frequency is lower, a low level is

output. The PD pin goes to the high impedance state

when the frequencies match.

• The n-channel MOS transistor used for the PLL active

low-pass filter.

• Accepts an input in the frequency range 0.4 to 12 MHz.

• The input signal is directly transmitted to the IF counter.

• The result is output starting the MSB of the IF counter

using the DO pin.

• Four measurement periods are supported: 4, 8, 32, and

64 ms.

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