Datasheet HT45F5Q-3 (Holtek) - 145

HT45F5Q-3 HT45F5Q-3 Battery Charger Flash MCU Battery Charger Flash MCU Application Descriptions Introduction
According to the battery current condition, the charger can use a Buck circuit to implement charger management. The battery charging contains constant voltage Mode and Constant current Mode. The HT45F5Q-3 device is specifically designed for battery charger applications. The above-mentioned function control can be implemented by the integrated battery charger management, these are described below.
Functional Description Operating Principle
The device contains a battery charge module which consists of three operational amplifier (OPA0~OPA2) functions, a 14-bit D/A converter (DAC0) and a 12-bit D/A converter (DAC1) functions. The open drain OPA0~OPA1 and DAC0~DAC1 are used for constant current and constant voltage signal control. The OPA output can directly drive the photo-coupler, which makes the PWM IC on the primary side can implement output power adjustment, shown in the figure below. The internal 20 times amplifier OPA2 is used to amplify the charge current signal, thus increasing the current resolution and reducing the detecting resistance power consumption. The constant voltage mode, constant current mode and constant current and constant voltage resolution increasing method are described as follows. R7 C9 HT45F5Q-3 5V VDD C5 C6 VSS D1 B+ AC_L OPA2P R5 C7 OPA2 ADC Rectifier/ R AC Filter/ DC C2 Battery1 Regulator 19R R1 R2 5V AC_N OPA0N OPA0 DAC0 14Bit R9 D2 5V B+ 5V LDO U2 PC817 R3 DAC1 12Bit R6 OPAE OPA1 Q1 OPA1N Current Mode C3 C4 PWM IC R4 C1 R8 C8
Battery Charge Module Constant Current Mode Description
Constant current charging means that the charge current will remain at a constant value no matter how the battery internal resistance changes. The principle is that the charge current flows through the detecting resistor R1 and in turn generates a voltage, which will be input to the OPA0 negative terminal through the OPA0N pin. The difference between the OPA0N voltage and the D/A converter voltage is amplified and then output on the OPAE pin. This output will be sent to the PWM IC via a photo-coupler. If the OPA0N voltage is lower than the DAC0 voltage, the PWM IC will increase the PWM duty cycle and vice versa. Note: The DA0H and DA0L registers are used to set the maximum current threshold. Rev. 1.00 144 July 31, 2019 Rev. 1.00 145 July 31, 2019 Document Outline Features CPU Features Peripheral Features General Description Block Diagram Pin Assignment Pin Description Absolute Maximum Ratings D.C. Characteristics Operating Voltage Characteristics Operating Current Characteristics Standby Current Characteristics A.C. Characteristics High Speed Internal Oscillator – HIRC – Frequency Accuracy Low Speed Internal Oscillator Characteristics – LIRC Operating Frequency Characteristic Curves System Start Up Time Characteristics Input/Output Characteristics Memory Characteristics LVR Electrical Characteristics A/D Converter Electrical Characteristics D/A Converter Electrical Characteristics Operational Amplifier Electrical Characteristics Software Controlled LCD Driver Electrical Characteristics Power-on Reset Characteristics System Architecture Clocking and Pipelining Program Counter Stack Arithmetic and Logic Unit – ALU Flash Program Memory Structure Special Vectors Look-up Table Table Program Example In Circuit Programming – ICP On-Chip Debug Support – OCDS Data Memory Structure General Purpose Data Memory Special Purpose Data Memory Special Function Register Description Indirect Addressing Registers – IAR0, IAR1 Memory Pointers – MP0, MP1 Bank Pointer – BP Accumulator – ACC Program Counter Low Register – PCL Look-up Table Registers – TBLP, TBHP, TBLH Status Register – STATUS Emulated EEPROM Data Memory Emulated EEPROM Data Memory Structure Emulated EEPROM Registers Erasing the Emulated EEPROM Writing Data to the Emulated EEPROM Reading Data from the Emulated EEPROM Programming Considerations Oscillators Oscillator Overview System Clock Configurations Internal High Speed RC Oscillator – HIRC Internal 32kHz Oscillator – LIRC Operating Modes and System Clocks System Clocks System Operation Modes Control Registers Operating Mode Switching Standby Current Considerations Wake-up Watchdog Timer Watchdog Timer Clock Source Watchdog Timer Control Register Watchdog Timer Operation Reset and Initialisation Reset Functions Reset Initial Conditions Input/Output Ports Pull-high Resistors Port A Wake-up I/O Port Control Registers Pin-shared Functions I/O Pin Structures READ PORT Function Programming Considerations Timer Modules – TM Introduction TM Operation TM Clock Source TM Interrupts TM External Pins Programming Considerations Compact Type TM – CTM Compact Type TM Operation Compact Type TM Register Description Compact Type TM Operation Modes Standard Type TM – STM Standard TM Operation Standard Type TM Register Description Standard Type TM Operation Modes Analog to Digital Converter A/D Converter Overview A/D Converter Register Description A/D Converter Data Registers – SADOL, SADOH A/D Converter Reference Voltage A/D Converter Input Signal A/D Converter Operation Conversion Rate and Timing Diagram Summary of A/D Conversion Steps Programming Considerations A/D Conversion Function A/D Conversion Programming Examples Battery Charge Module Battery Charge Module Registers Digital to Analog Converter Operational Amplifiers Universal Serial Interface Module – USIM SPI Interface I2C Interface UART Interface Software Controlled LCD Driver LCD Operation LCD Bias Current Control Cyclic Redundancy Check – CRC CRC Registers CRC Operation Interrupts Interrupt Registers Interrupt Operation External Interrupts Time Base Interrupts Multi-function Interrupts TM Interrupts A/D Converter Interrupt USIM Interrupt Interrupt Wake-up Function Programming Considerations Application Descriptions Introduction Functional Description Hardware Circuit Instruction Set Introduction Instruction Timing Moving and Transferring Data Arithmetic Operations Logical and Rotate Operation Branches and Control Transfer Bit Operations Table Read Operations Other Operations Instruction Set Summary Table Conventions Instruction Definition Package Information 24-pin SSOP (150mil) Outline Dimensions 28-pin SSOP (150mil) Outline Dimensions