DIO59618A

Version 1.0, Oct 2025

www.dioo.com

© 2025 Dioo Microcircuits Co., Ltd. Jiangsu

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9.8. Working mode

9.8.1. Mode status declaration

When the VBUS is connected, the DIO59618A supports to charge the bottom warehouse battery while

discharging.

When the VBUS is not connected and the charging current of all headsets in the warehouse is detected to

fall below IOFF for a period of time, MCU will disconnect the charging switches Q6 and Q7 of the two

headphone channels, enabling the detection function. At this time, LDO maintains 3 V output and I2C

interface remains in communication state with load detection activated.

When the VBUS is not connected, according to production or user requirements, MCU will write the

command to DIO59618A register through I2C in order to enter into ship mode.

When detecting that the charging current of the left/right earphone is below IOFF, the MCU needs to actively

turn off the charging switch of the corresponding loop, and open the pull-up current source of the

corresponding channel for the earphone in/out of the warehouse detection, so as to timely detect the

movement of the left/right earphone in/out of the warehouse. The optional pull-up current source can be 1

μA, 5 μA, 10 μA, or 20 μA.

9.9. Programming

9.9.1. I2C interface

The DIO59618A serial interface is compatible with Standard, and Fast Mode I2C Bus specifications. The

SCL line is an input and its SDA line is a bi-directional open-drain output. The SDA line only pulls low during

data reads and when signaling ACK. All data is shifted in most significant bit (MSB, bit 7) first.

9.9.2. Slave address

Table 12 shows the default I2C slave address. The LSB of the address byte is used as the read/write bit and

is not included in the 7-bit Hex, Decimal, or Binary value as shown in Table 12. Table 13 shows the location

of the R/W bit.

Table 12. I2C slave address

Device

Hex

Decimal

7 bit Binary

DIO59618A

35h

53d

011 0101

Table 13. I2C (7 bit) slave address byte

7

6

5

4

3

2

1

0

0

1

1

0

1

0

1

R/W