DIO59618A

Version 1.0, Oct 2025

www.dioo.com

© 2025 Dioo Microcircuits Co., Ltd. Jiangsu

18

9.6. Communication mode

The DIO59618A supports bidirectional independent communication between the bottom compartment and

the headset. It receives and sends signals through the VOL/R connection with the headset, interacts with

the MCU through COML/COMR. It also controls the entry and exit of the communication mode through the

I2C register. The communication function of DIO59618A mainly includes isolation communication,

communication level conversion, and communication function entry/exit.

For isolated communication function, the communication mode is disabled in normal cases. VOL/R is used

to detect the headset load and charge the headset. All communication detection functions are disabled.

When the DIO59618A enters the communication mode through register operation, the VOL/R discharge,

automatic identification, and detection functions will be disabled to realize the isolation and enter the

communication mode.

Table 11. COM_CFG register

Register Address Bit R/W/C Default

Symbol

Description

COM_CFG

0x09

Bit7

R/W

0

NC

NC

NC

Bit6

R/W

0

COM_VLDO

0: 1.8 V

1: 2.5 V

Bit5

R/W

0

COMR_EN

0: VOR communicate

disabled

1: VOR communicate

enabled

Bit4

R/W

0

COML_EN

0: VOL communicate

disabled

1: VOL communicate

enabled

Bit3

R/W

0

VOR_TRX

0: MCU transmit data

1: MCU receive data

Bit2

R/W

0

VOL_TRX

0: MCU transmit data

1: MCU receive data

Bit1

R/W

0

NC

NC

NC

Bit0

R/W

0

NC

NC

NC

9.7. LDO output

When the VBUS is connected to the normal voltage, it supplies LDO. When the VBUS is removed or below

the normal rate, VBAT will seamlessly replace it. The LDO output defaults to 3 V and supports up to 30 mA

on load. After normal power-on, LDO output is supported by default. LDO output can only be disabled in the

following two cases:

1. When no VBUS is connected and the VBAT is under voltage.

2. MCU controls the DIO59618A to enter ship mode by writing register through I2C, and then the user can

choose to turn off the LDO or not.