Analog Integrated Circuit Device Data



Freescale Semiconductor

4

BC3770

3

Pin Connections

Figure 3. BC3770 Pin Connections (Transparent Top View)

Functional descriptions of many of these pins can be found in the Functional Pin Description section beginning on page 13.

Table 2. BC3770 Pin Definitions

Pin

Pin Name

Pin

Function

Formal Name

Definition

A1, A2

VBUS

Input

USB/DCP Adapter Input

Connect the pins to the output of USB or DCP (dedicated Charging Port)

adapter. Bypass with a 2.2

F/10 V ceramic capacitor to the ground, in case the

peak voltage on the pins is always below 10 V due to a clamp device. Otherwise,

a 2.2

F/25 V or higher rating capacitor is recommended. The two VBUS pins

must be connected together externally. These pins are used as an output in OTG

mode. An embedded 100 k

discharge resistance is enabled in Charge mode.

It is disconnected in the Boost mode.

A3

VL

Output

Internal Regulator Output

The analog output for internal reference, bandgap and so on. DO NOT LOAD.

Bypass with a 1.0

F/10 V to ground.

A4

SCL

Input

Serial Interface with the

Processor

Use a pull-up resistor, 1.5 k

 to 2.2 k, to the VIO.

A5

SDA

Input/

Output

Interface with the Processor

Use a pull-up resistor, 1.5 k

 to 2.2 k, to the VIO.

B1

PMID

Output

VBUS Bypass Output

High-side MOSFET connection node and VBUS bypass output. Bypass with a

2.2

F ceramic capacitor to PGND pins as close as possible. Do NOT LOAD any

external applications.

B2

BOOT

High-side MOSFET Driver

Supply

Bypass BOOT to LX with a 22 nF/10 V ceramic capacitor.

B3

BATSNSN

Battery - Terminal Sensing

Connect to negative terminal of battery cell as close as possible. If a sense

resistor is used for a fuel gauge, connect the pin to the ground terminal of the

sense resistor.

B4

VIO

Supply for Internal Buffer

Connect to the system I/O supply voltage rail.

TRANSPARENT

TOP VIEW

A

B

C

D

E

1

2345

VBUS

PMID

LX

LX

PGND

VBUS

BOOT

NO

CHG

PGND

BAT

ENB

VL

BAT

GND

SH

VSYS

SNSN

DNB

SCL

VIO

BAT

VSYS

VSYS

REG

SDA

INTB

CHG

OUT

CHG

OUT

CHG

OUT