Rev. 1.10
6
November 04, 2019
Rev. 1.10
7
November 04, 2019
HT45F5Q-3
Battery Charger Flash MCU
HT45F5Q-3
Battery Charger Flash MCU
General Description
The HT45F5Q-3 is a Flash Memory A/D type 8-bit high performance RISC architecture
microcontroller especially designed for battery charger applications
.
Offering users the convenience
of Flash Memory multi-programming features, this device also includes a wide range of functions
and features. Other memory includes an area of RAM Data Memory as well as an area of Emulated
EEPROM memory for storage of non-volatile data such as serial numbers, calibration data etc.
Analog feature includes a multi-channel 12-bit A/D converter function. An extremely flexible Timer
Module provides timing, pulse generation and PWM generation functions. Communication with the
outside world is catered for by including fully integrated SPI, I
2
C and UART interface functions,
three popular interfaces which provide designers with a means of easy communication with external
peripheral hardware. Protective features such as an internal Watchdog Timer and Low Voltage
Reset coupled with excellent noise immunity and ESD protection ensure that reliable operation is
maintained in hostile electrical environments.
A full choice of internal low and high speed oscillator functions is provided including a fully
integrated system oscillator which requires no external components for its implementation. The
ability to operate and switch dynamically between a range of operating modes using different
clock sources gives users the ability to optimise microcontroller operation and minimise power
consumption.
For AC/DC charger applications, the device 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 current and constant voltage can be obtained by configuring
the D/A Converters in the software. The 14-bit D/A Converter is used for constant current control
while the 12-bit D/A Converter is used for constant voltage 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 Emulated 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.
The inclusion of flexible I/O programming features, Time-Base functions along with many
other features, further enhance device functionality and flexibility for wide range of application
possibilities.
