TSU6721 datasheet(34/45 Pages) TI2

34 / 45 page

TSU6721YFF

SCDS345 – JUNE 2013

www.ti.com

CRITICAL COMPONENTS

PIN NAME

PIN NUMBER

CRITICAL COMPONENT

VBUS

A5, B5

2.2

Ω

1 µF~10 µF

VDDIO

0.1 µF

1 µF~10 µF

VBAT

Battery

0.1 µF

JIG

1 k

Ω~10 kΩ

2.2 k

Ω

MIC

10 µF

ISET

Resistor determined by Battery Charger

S_R

220 µF(1)

S_L

220 µF(1)

OUT

A4, B4

10 µF

SCL

1 k

Ω~10 kΩ

SDA

1 k

Ω~10 kΩ

2.2

Ω

ESD Protection Diode

2.2

Ω

ESD Protection Diode

2.2

Ω(1)

ESD Protection Diode

(1)

Optional Components

SCHEMATIC GUIDELINES

1. VBUS, VDDIO, and VBAT require decoupling capacitors to reduce noise from circuit elements. The

capacitors act as a shunt to block off the noise. The 0.1µF capacitor smoothes out high frequencies and has

a lower series inductance. The 1µF~10µF and 1µF capacitors smooth out the lower frequencies and have a

much higher series inductance. Placing both decoupling capacitors will provide better load regulation across

the frequency spectrum.

2. OUT requires a 10µF load capacitor to prevent sudden increases of voltage on the pin during charging

3. JIG is an open-drain output and therefore requires a 1k

Ω ~ 10kΩ pull-up resistor to VBAT

4. ISET is an open drain output. It can be used by the battery charger to set the input current limit with a series

resistor (for example 75

Ω determined by the charger)

5. SCL and SDA require 1k

Ω ~ 10kΩ pull-up resistors to VDDIO to prevent floating inputs

6. Depending on the codec used, S_R and S_L may require DC blocking capacitors as high as 220µF. The

capacitor might not be needed if the codec has the capability to provide ground centered signals.

7. Mic requires a 2.2k

Ω pull-up resistor to MIC_BIAS to provide DC bias for the microphone. Additionally the

10µF capacitor is required to block the DC signals from MIC_BIAS to the Audio Codec

8. VBUS, DM and DP are recommended to have an external resistor 2.2

Ω to provide extra ballasting to protect

the chip and internal circuitry

(a) For ID, if there is less stress on the ID pin then the external 2.2

Ω resistor is optional

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