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CTRL1

CTRL2

Mode

NonClip1

GND

NonClip2

GND

NonClip-off

GND

SHUTDOWN

“H” level indicates a microcomputer’s I/O port H level output voltage. “GND” level indicates a

GND level output voltage. According to different “H” level output voltage of microcomputer, different

external resistors (Rctrl1、Rctrl2 and Rctrl3) should be taken.

Connect the CTRL terminal to the GND through a capacitor Cctrl.

“H”level output voltage

of MCU or BB

1.8V

2.6V

3.0V

3.3V

5.0V

Rctrl1

27kΩ

33KΩ

56KΩ

Rctrl2

56KΩ

68KΩ

120KΩ

Rctrl3

82KΩ

27KΩ

22KΩ

18KΩ

15KΩ

In CONFIG 2 of CTRL, A RC filter with time constant of 1m sec or more is used to eliminate noise

at transmission side such as Micon etc. (Example. Rctrl=10kΩ and Cctrl=0.1Μf). Only the following

two mode can be set: NonClip1, and shutdown mode. When CTRL1 is “H” level voltage, BL6331

work in NonClip1 mode. When CTRL1 is “L” level voltage, BL6331 work in shutdown mode.

Work mode switch

When CTRL terminal is connected to GND potential, BL6331 work in “shutdown” mode. The

entire circuit function stop and its current consumption becomes the lowest. At startup, the CTRL

must be first set to “Nonclip1” mode（

（

（CTRL1 and CTRL2 is “

“

“H”

”

”）。

）。

）。The shutdown mode is

cancelled and IC starts up after startup time (tstup). Then, by setting the voltage of CTRL1 or

CTRL2，

，

，IC can switch to nonclip2 or nonclip-off MODE. When IC works in shutdown mode, the

IC must restart after tSD. The switching of work mode is shown in the following graph.

The timing of work mode switch

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