Introduction; Evm Features; General Description; I/O Header Descriptions - Texas Instruments BQ24210/2 User Manual

Introduction

1 Introduction
1.1

EVM Features

• 800-mA, single-input, single-cell Li-ion battery solar charger
• Resistor-programmable setting for charge current and input voltage dynamic power management
• LED Indication for status
• Test points for key signals available for testing purposes – easy probe hook-up
• Jumpers available – easy to change setting
1.2

General Description

The bq24210/2 series of devices are highly integrated Li-ion linear chargers devices targeted at space-
limited portable applications. The high input voltage range with input overvoltage protection supports low-
cost unregulated adapters. The input voltage regulation loop with programmable input voltage regulation
threshold make it suitable for charging from alternative power sources, such as solar panel or inductive
charging pad. The integrated circuit (IC) has a single power output that charges the battery. A system load
can be placed in parallel with the battery as long as the average system load does not keep the battery
from charging fully during the 10-hour safety timer. The bq24210 has an EN pin whereas the bq24212 has
a MODE pin. See the data sheet for an explanation of the differences between the two pins.
The battery is charged in three phases: conditioning, constant current' and constant voltage. In all charge
phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an
internal temperature threshold is exceeded.
For additional details, see the bq24210 (SLUSA76) or bq24212 (SLUSAL2) data sheet.
1.3

I/O Header Descriptions

Jack
J1–VBUS
J1–GND
J2–BAT
J2–GND
J2–TS
J3-GND
J3-VDPM
J3-CHG
J3-EN (BQ24210 only)
J3-MODE (BQ24212 only)
J3-PG
J4-ISET
J4-VTSB
J4-GND
2
800-mA, Single-Input, Single-Cell, Li-Ion Battery Solar Charger
Table 1. I/O Header Descriptions
Description
Positive input
Negative input
Charger output
Ground
Temperature qualification input
Ground
Programs the input voltage regulation threshold
Charge status indication
Chip Enable control. This pin must be pulled low in order for the device to
operate.
Chip MODE control. See data sheet for explanation of chip operation when
MODE is high and low.
Power present indication
Programs the fast-charge current setting
TS bias reference voltage pin, regulated output
Ground
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SLUU477B – December 2010 – Revised November 2015
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