Bq20Z60/Bq29330 Circuit Module Schematic; Circuit Module Physical Layouts And Bill Of Materials; Components And Flash-Memory Settings For Different Precharge Modes - Texas Instruments bq20z60EVM-001 User Manual

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bq20z60/bq29330 Circuit Module Schematic

This section contains information on the schematic for the bq20z60/bq29330/bq29412 implementation.
3.1 Schematic
The schematic follows the bill of materials in this user's guide.
3.2 Modifications for Choosing Particular Precharge Mode
In order to charge, the charge FET (CHG-FET) must be turned on to create a current path. When the
V is 0 V and CHG-FET = ON, the V
(BAT)
voltage for the device is too low to operate. This function has three possible configurations, and the
bq29330 can be easily configured according to the application needs. The three modes are 0-V Charge
FET mode, Common FET mode, and Precharge FET mode.
1. 0-V Charge FET mode - Dedicates a precharge current path using an additional FET (ZVCHG-FET) to
sustain the PACK+ voltage level.
2. Common FET mode - Does not use a dedicated precharge FET. The charge FET (CHG-FET) is set to
ON state as default.
3. Precharge FET mode - Dedicates a precharge current path using an additional open-drain (OD) pin
drive FET (PCHG-FET) to sustain the PACK+ voltage level.
To use a particular mode of charging with the EVM, add or remove some elements shown in
use the given settings of DF.Configuration, ZVCHG1, 0.
Table 1. Components and Flash-Memory Settings for Different Precharge
MODE
1 0-V Chg
(default)
2 Common FET
3 Precharge
For more details about precharge operation and mode choices, see the bq29330 data sheet at
(SLUS673).
3.3 Testing Fuse-Blowing Circuit
To prevent the loss of board functionality during the fuse-blowing test, the actual chemical fuse is not
provided in the circuit. FET Q1 drives TP3 low if a fuse-blow condition occurs; so, monitoring TP3 can be
used to test this condition. Fuse placement on the application board is shown in the bq20z60 data sheet
reference-board schematic.
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Circuit Module Physical Layouts and Bill of Materials

This section contains the board layout, bill of materials, and assembly drawings for the bq20z60/ bq29330/
bq29412 circuit module.
SLUU354 – June 2009
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is as low as the battery voltage. In this case, the supply
(PACK)
Modes
RESISTORS PRECHG FET
R18, R23 Q3
R20 Q2
R19, R23 Q3
bq20z60/bq29330 Circuit Module Schematic
ZVCHG1
0
0
1
bq20z60EVM-001 SBS 1.1 Impedance Track™ Technology
Enabled Battery Management Solution Evaluation Module
Table 1, and
ZVCHG0
0
1
0
3