Texas Instruments bq2415x, User Manual

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Introduction
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1 Introduction
1.1 EVM Features
• Evaluation module for bq2415x
• High-efficiency, fully integrated NMOS-NMOS synchronous buck charger with 3-MHz frequency
• Integrated power FETs for up to 1.25-A charge rate
• Programmable battery voltage, charge current, and input current via I
2
C™ interface
• Input operating range 4 V–6 V
• Boost mode operation for USB OTG
• LED indication for status signals
• Test points for key signals available for testing purposes. Easy probe hook-up.
• Jumpers available. Easy to change connections.
1.2 General Description
The bq2415x evaluation module is a complete charger module for evaluating compact, flexible,
high-efficiency, USB-friendly switch-mode charge management solution for single-cell Li-ion and
Li-polymer batteries used in a wide range of portable applications.
The bq2415x integrates a synchronous PWM controller, power MOSFETs, input current sensing,
high-accuracy current and voltage regulation, and charge termination, into a small WCSP package.
The charge parameters can be programmed through an I
2
C interface.
For details, see the bq2415x data sheet ( SLUS942 ).
1.3 I/O Description
Table 1. Input/Output Jack Descriptions
Jack Description
J1–DC+ AC adapter or USB, positive output
J1–DC– AC adapter or USB, negative output
J2–BAT+ Charger positive output, connect to CSOUT pin
J2–AUXPWR/CD Connect to AUXPWR/CD pin
J2–BAT– Battery negative terminal, connect to DC-
J3–SCL I2C clock, connect to SCL pin
J3–SDA I2C data, connect to SDA pin
J3–DC– AC adapter or USB, negative output
J4–STAT Status output, can be connected to STAT pin by JMP1 set to EXT (2-3)
J4–OTG/SLRST/TS/ISEL Connect to OTG/SLRST/TS/ISEL pin
J4–DC– AC adapter or USB, negative output
1.4 Controls and Key Parameters Setting
Table 2. Control and Key Parameters Settings for JMP1 Through JMP5
Jack Description Factory Setting
JMP1 LED 1-2: Connect STAT pin to LED on EVM Jumper On LED (1-2)
EXT 2-3: Connect STAT pin to J4-1
JMP2 HI 1-2: OTG/SLRST/TS/ISEL high (input or battery voltage) See table below
LO 2-3: OTG/SLRST/TS/ISEL low (ground)
JMP3 J2-BAT+ connect to J2-AUXPWR/CD See table below
JMP4 AUXPWR/CD pin connect to high or low or float See table below
JMP5 OTG/SLRST/TS/ISEL pin 10k resistor to ground or float Jumper On
2 bq2415x RGY EVM (HPA255) SLUU366A – March 2010 – Revised April 2010
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