FS970X

Rev. 4.4

15/46

Buzzer Generator

FBP generator is controlled by ENBP. CNTBP and CMP1. The true value Chart is shown in Chart 4.

ENBP CNTBP CMP1

H

X

X

2.6 kHz

L

L

X

0, (L)

L

X

L

0, (L)

X

H

H

2.6 kHz

Chart 4. FBP true value Chart

The output of buzzer, BZR, is an open drain output. It can be connected to an external pull-up resistor to pull

the “Hi” output to the required voltage. When ENBP is “Hi” or CMP1 and CNTBP are both “Hi”, BZR will produce

approx. 2.6 kHz square-wave output to initiate buzzer. ENBP and CNTBP can be set up directly by digital

interface while the value of CMP1 is related to the measurement status. Please refer to Function Network for

details.

When ENOSCO_=0, the square-wave output of OSCO is fixed to be 2.000 MHz. When ENOSCO_=1,the fixed

output is 0. This will save VCC power consumption.