ST STUSBCD01B User Manual

Features

■ Capable of detecting dedicated USB chargers

and host chargers (current sink and dedicated
methods)

■ Operates with V

supply voltage ranging

BAT

from 2.2 V to 4.5 V

■ Active high open drain hardware detection pin

(DETECT)

■ GPIO control interface

■ 1.6 V - 2.8 V interface voltage range (V

■ V

■ Low DP-DM input capacitance

■ ESD: HBM ± 2 kV, CDM 500 V on every pin

■ 12 bumps Flip-Chip package, 1.6 x1.2 mm,

voltage 6 V clamping circuit

BUS

IO

)

pitch 0.4 mm, max thickness 0.60 mm,
Halogen free RoHS compliant package

Applications

■ Mobile phones

■ PDAs, MP3 players

STUSBCD01B

USB charger detection interface

Flip-Chip 12 (1.6 x 1.2 mm)

Operation is controlled through three general
purpose I/O pins; a hardware open drain
detection output is also available.

An internal regulator provides the 1.8 V supply
voltage for the internal blocks and state machine
while a clamping device prevents V
from going over 6 V (typ.).

The STUSBCD01B is available in a 12 bumps
Flip-Chip 0.4 mm pitch package.

BUS

voltage

Description

The STUSBCD01B is a USB charger detection IC
which can detect dedicated USB chargers,
Host/Hub chargers or standard host ports
connected to the USB DP/DM data lines.

The device implements two different detection
methods in order to be able to distinguish
between a dedicated charger and a Host/Hub
charger.

Table 1. Device summary

Order code Package Packaging

STUSBCD01BJR Flip-Chip 12 (1.6 x 1.2 mm) 3000 parts per reel

November 2008 Rev 1 1/19

www.st.com

19

Contents STUSBCD01B

Contents

1 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.1 Detection methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.2 Dedicated charger detection method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.3 Current sink method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.4 Detection triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.5 V

3.6 Internal regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

clamping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

BUS

4 Functional tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

7 Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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STUSBCD01B Application

1 Application

Figure 1. Application circuit

3/19

Pin configuration STUSBCD01B

2 Pin configuration

Figure 2. Bump configuration (top through view)

Table 2. Pin description

Bump

name

Symbol Type Description

C3 VBAT PWR Analog supply voltage input (2.2 V - 4.5 V)

C2 GND PWR Ground reference

A3 V

IO

PWR Digital interface supply voltage (1.6 V - 2.8 V)

B4 DP AI/O Connected to USB D+ Data line

A4 DM AI/O Connected to USB D- Data line

B2 DETECT O

A2 SHUTDOWN I

Hardware detection pin (open drain). 300 kΩ internal pull-down resistor. V
referred.

Standby mode selection pin. Active HIGH. Terminates the detection and resets
the device.

A1 /OE I Output enable for DETECT output. Active LOW.

SW detection output: High when Charger detected. Pulled high or low through

B1

STATUS/

METHOD

internal weak pull-up to 1V8V and weak pull-down.

AI/O

Detection method selection input: low for dedicated method, high for current sink
method.

B3

DEFAULT
METHOD

C4 VBUS AI

Hardware selection for detection method. Active only if V
Dedicated method is selected if driven low, current sink method if driven high.

AI

referred. Do not leave floating to avoid increased power consumption.

V

BAT

voltage comparator input. Triggers the charger detection. 6V limited voltage

V

BUS

when 10 V are applied externally.

is not present.

IO

BAT

C1 1V8V O Regulator output voltage. Bypass capacitor not required.

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STUSBCD01B Functional description

3 Functional description

The STUSBCD01B is designed to provide USB charger detection functionality to USB
platforms which do not have this feature integrated in the PHY. The device can work with a
supply voltage ranging from 2.2 V to 4.5 V and has an internal regulator which generates the

1.8 V voltage required for the internal blocks and state machine.

The STUSBCD01B can detect a dedicated charger or a Host/Hub charger connected to
USB data lines and provides both an open drain pin and a digital I/O pin for the detection
output signal. The open drain output can be disabled using the /OE input signal.

Two different detection methods, selectable through the STATUS/METHOD pin, are
implemented in order to distinguish between a dedicated charger and a Host/Hub charger. If
the interface voltage is not present the detection method is defined by the status of default
method pin.

The STUSBCD01B features very low power consumption in Standby mode and low input
capacitance on DP/DM pins. An over voltage protection circuit is also implemented on the
VBUS pin in order to limit V
connected to it.

voltage to 6 V and provide protection to external devices

BUS

3.1 Detection methods

The STUSBCD01B implements a current source/sink method to detect dedicated chargers
(wall chargers) and a current sink method for Host/Hub chargers (based on USB battery
charging spec v1.0). If a standard Host/Hub is connected to the device it is recognized
thanks to its pull-down resistors on DP/DM lines and therefore DETECT/STATUS outputs
will be low.

3.2 Dedicated charger detection method

Selected driving method pin low during the falling edge of shutdown or driving default
method pin low if V
source on DP pin and a current sink on DM pin to detect the resistor (max 200 Ω) which
connects DP and DM in dedicated chargers.

is not present. The dedicated charger detection method uses a current

IO

3.3 Current sink method

Selected driving method pin high during the falling edge of shutdown or driving default
method pin high if V
and a current of IDAT_SINK is drawn from DM.

If a Host/Hub charger is connected, STUSBCD01B will see a voltage of VDAT_SRC on pin
DM. The same happens if a dedicated charger is connected and, therefore, in order to
distinguish between the two, if the current sink method detection is successful it is
necessary to run the dedicated charger detection method immediately after.

is not present. A voltage source of VDAT_SRC is connected to DP

IO

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Functional description STUSBCD01B

3.4 Detection triggering

USB Charger detection automatically starts when V
and shutdown input is low.

If V
detection is immediately terminated.

If no charger is detected (DETECT = 0 and /OE = 0), V
threshold and V

If a charger is detected, detect and status pins are kept high until V
V

Any hardware detection (V
V

3.5 V

The STUSBCD01B features a built in over voltage protection circuit which prevents V
voltage from going over 6 V. The device is able to withstand continuous voltages of up to
10 V applied to V
the voltage to 6 V within 1 µs. A 470 Ω resistor in series between V
is required. Any external device needing V
STUSBCD01B's V

Minimum input resistance for V
400 kΩ.

drops under V

BUS

TH_VBUS

threshold.

TH_IO

clamping

BUS

TH_VBUS

is not present then a new detection is started every 1 s.

IO

threshold or shutdown input is pulled high, the charger

threshold or a new detection is started.

not present) is terminated as soon as VIO voltage rises above

IO

pin through an external resistor; in this case the clamping circuit limits

BUS

over-voltage protection must be connected to

BUS

BUS

pin.

pin in normal operating conditions (up to ~ 5.3 V) is

BUS

voltage is over V

BUS

voltage is kept over V

BUS

TH_VBUS

drops under

BUS

voltage and V

BUS

threshold

BUS

BUS

pin

TH_VBUS

3.6 Internal regulator

The STUSBCD01B has an internal regulator which outputs 1.8 V (nominal) to supply
internal blocks. The regulator does not require any bypass capacitor for stability.

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