Texas Instruments TPS658 EVM Series, User Manual

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Software Feature Description
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4.2 Charger
The charger section allows the user to monitor and control the charger functions of the
TPS65800/810/820/825 (see
Figure 3 ). The TPS65820/825 IC has a unique feature on power up. After
the 150-ms USB boot-up, the PMIC defaults to battery power unless the CE pin is written high prior to the
boot-up expiring. The CE pin is at address 9_B0 and is changed via I2C. If the battery is not present and
CE is not written high prior to the end of the boot-up, then the system crashes because the BAT pin
cannot supply the power. The following controls are available.
• Set Battery Charge Voltage (pulldown window): Default set to 4.2 VDC. To set to 4.36 VDC, select and
then confirm yes.
• Set Charge Rate as a percentage of maximum programmed by ISET1 (pulldown window): Select one
of four choices 25%, 50%, 75%, or 100% of ISET1 programmed level.
• USB pin input current limit (pulldown window): Select the maximum allowed USB input current level,
100 mA, 500 mA, or 2.75 A (soft internal limit).
• System Power Source (pulldown window): Select AC , USB or Battery or Battery Only (AC/USB disable
mode).
• Charge Suspend (box): The user can suspend charge by checking the box.
Charger status indications are:
• Power Good – Indicates if voltages at AC or USB inputs are greater than the battery voltage.
• Status – Indicates if the charger is in Pre-charge, Fast Charge, Charge Done or Charge Suspend
mode.
• Overvoltage – Indicates if the AC or USB source are within voltage range.
• Dynamic Power Path Management (DPPM) – Powers the system via AC, USB, and/or BAT (see the
diagram in
Figure 3 ).
The information windows are data collected and reported by the ADC such as the battery voltage, the
system voltage, the IC temperature, and detection of BATT ID resistor.
Figure 3. Charger Section
8 TPS658xxEVM Integrated Single-Cell, Lithium-Ion Battery- and Power- SLVU154B – March 2006 – Revised October 2013
Management IC With I2C, LED Drives, Two Synchronous Buck, Boost, and
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