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Holtek's advanced Battery Charger Solutions 2017-08-18 09:24:11
Holtek's advanced Battery Charger SolutionsHT45F5Q-2
Charger Flash MCU
For AC/DC charger applications, the Charger ASSP Flash MCU HT45F5Q-2 includes a battery charger management module, which can be used for the constant voltage and constant current closed loop charging control. The device therefore reduces the need for the usually required external TL431 component, operational amplifier and resistance analogic D/A Converter in traditional battery charging circuits. Therefore the peripheral circuit is more reduced, resulting in a smaller PCB area.
The charger management module is composed of two parts. The first part contains two groups of OPAs and D/A Converters, which are used to control the charging voltage and current. The upper limit value of the charger constant voltage and constant current can be obtained by configuring the D/A Converters in the software. The 12-bit D/A Converter is used for constant voltage control while the 8-bit D/A Converter is used for constant current control. The second part of the charger management contains a fixed gain operational amplifier which is used for current amplification. This improves the current resolution and allows the use of smaller current detection resistors thus reducing the resistor power consumption.
The D/A Converter in the charger management module is not only used for setting charging voltage and current, but also can be used together with the specific charger production fixtures for improving the traditional manual calibration techniques. By using the external production fixtures, the charger current voltage/current conditions can be confirmed. If the margin of errors is exceeded, the MCU will correct the error by fine tuning the D/A Converter, and store the corrected parameters to EEPROM. When the charger is recharged, the D/A Converter will be given a new correction value to implement correction purpose. Refer to the Holtek application notes for more details.

Software & Tools
CPU Features
Operating voltage:
fSYS= 8MHz: 2.2V~5.5V
Up to 0.5us instruction cycle with 8MHz system clock at VDD=5V
Power down and wake-up functions to reduce power consumption
Oscillator types:
- Internal High Speed 8MHz RC – HIRC
- Internal Low Speed 32kHz RC – LIRC
Multi-mode operation: FAST, SLOW, IDLE and SLEEP
Fully integrated internal high speed and low speed RC oscillators require no external components
All instructions executed in one or two instruction cycles
Table read instructions
63 powerful instructions
6-level subroutine nesting
Bit manipulation instruction
Peripheral Features
Flash Program Memory: 2Kx16
RAM Data Memory: 128x8
True EEPROM Memory: 32x8
Watchdog Timer function
15 bidirectional I/O lines
Single pin-shared external interrupt
Single Timer Module for time measurement, compare match output or PWM output function
Fully-duplex Universal Asynchronous Receiver and Transmitter Interface – UART
Dual Time-Base functions for generation of fixed time interrupt signals
Multi-channel 12-bit resolution A/D converter
Battery charger circuit
- 8-bit D/A Converter and OPA0 are used for constant current control
- 12-bit D/A Converter and OPA1 are used for constant voltage control
- OPA2 is 10 times amplifier for current sense
Low voltage reset function
Package type: 20-pin NSOP
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