HM5266 / Shenzhen Huazhimei Semiconductor Co., Ltd

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Part No.	HM5266
Manufacturer	HMSEMI
Size	187 Kbytes
Pages	4 pages
Description	IC for Apple Headphone Cable

Datasheet Summary with AI

# HM5266 Apple Earphone Line Dedicated IC

## Overview

This IC is designed for Apple digital product earphone lines, supporting traditional earphone functionality, remote control (music/video playback, volume adjustment), and microphone features.

## Features

️· Supports button decoding for volume adjustment and music/video playback control.
️· Small size.

## Application

️· Used in Apple digital product earphone lines.

## Ordering Information

Col1 封装型号封装形式

HM5266 SOT23-6

## Pinout and Description

Pin Number Pin Name Description

1 VOL+ Volume+

2 GND Ground

3 COL Current

4 VDD Positive Power Supply

5 VOUT Output

6 VOL- Volume-

## Electrical Characteristics (TA=25℃)

Parameter Symbol Test Conditions Minimum Typical Maximum Unit

Supply Voltage VCC -- 1.5 -- 5 V

Working Current ICC VDD=3V -- 60 80 uA

Standby Current Istandby VDD=3V -- 3 5 uA

Oscillator Frequency Fosc VDD=3V -- 2 -- MHz

Input High Level VIH1 VDD=3V 1.5 -- -- V

Input High Level VIH2 VDD=1.5V 1.0 -- -- V

Input Low Level VIL1 VDD=3V -- -- 0.4 V

Input Low Level VIL2 VDD=1.5V -- -- 0.4 V

Output High Level VOH1 VDD=3V, Isource=5mA 2.5 -- -- V

Output High Level VOH2 VDD=1.5V, Isource=5mA 1.2 -- -- V

Output Low Level VOL1 VDD=3V, Isink=5mA -- -- 0.3 V

Output Low Level VOL2 VDD=1.5V, Isink=5mA -- -- 0.3 V

Oscillator Duty Cycle Dclk -- 45 50 55 %

## Functional Description

️· Four frequencies are used:
- Head: 3.69uS=271kHz
- Key Release: 10.3uS=97kHz
- +: 7.69uS=165kHz
- -: 6.06uS=130kHz
️· Built-in 2MHz oscillator.
️· Transmission sequence:
- Handshake: After power-on (voltage > 1.8V), transmit a waveform: 0.9mS "Head" + 5.5mS "+".
- Press "+": Send 1mS "Head" + 2mS "+".
- Press "-": Send 1mS "Head" + 2mS "-".
- Release key: Send 1mS "Head" + 2mS "Key Release".
️· MIC signal is disabled during transmission.
️· PA1=L for handshake transmission, PA1=L for button waiting, PA1=H for frequency transmission.
️· Working current: <70uA during waveform transmission, 3uA during standby, <6uA during operation.
️· Can be packaged in DFN2*2 with a thickness of 0.5mm.
️· Vol+ and Vol- have internal pull-up resistors of 100kΩ.

## PCB and BOM

️· PCB diagram (visual representation).
️· BOM Table:

Item Component Model Quantity Location

1 PCB HM5266 1

2 Resistor 10K 5% 0402 1 R1

3 IC HM5266 1 IC

4 Microphone 4013 1 MIC

5 Pot Diameter 3mm 3 K1\2\3

## Packaging Information

Pin Number	Pin Name	Description
1	VOL+	Volume+
2	GND	Ground
3	COL	Current
4	VDD	Positive Power Supply
5	VOUT	Output
6	VOL-	Volume-

Parameter	Symbol	Test Conditions	Minimum	Typical	Maximum	Unit
Supply Voltage	VCC	--	1.5	--	5	V
Working Current	ICC	VDD=3V	--	60	80	uA
Standby Current	Istandby	VDD=3V	--	3	5	uA
Oscillator Frequency	Fosc	VDD=3V	--	2	--	MHz
Input High Level	VIH1	VDD=3V	1.5	--	--	V
Input High Level	VIH2	VDD=1.5V	1.0	--	--	V
Input Low Level	VIL1	VDD=3V	--	--	0.4	V
Input Low Level	VIL2	VDD=1.5V	--	--	0.4	V
Output High Level	VOH1	VDD=3V, Isource=5mA	2.5	--	--	V
Output High Level	VOH2	VDD=1.5V, Isource=5mA	1.2	--	--	V
Output Low Level	VOL1	VDD=3V, Isink=5mA	--	--	0.3	V
Output Low Level	VOL2	VDD=1.5V, Isink=5mA	--	--	0.3	V
Oscillator Duty Cycle	Dclk	--	45	50	55	%

Item	Component	Model	Quantity	Location
1	PCB	HM5266	1
2	Resistor	10K 5% 0402	1	R1
3	IC	HM5266	1	IC
4	Microphone	4013	1	MIC
5	Pot	Diameter 3mm	3	K1\2\3