Datasheet HT45B3305H (Holtek) - 8
| Manufacturer | Holtek |
| Description | CAN Bus Controller |
| Pages / Page | 60 / 8 — HT45B3305H. CAN Bus Controller. Power-on Reset Characteristics. Test … |
| File Format / Size | PDF / 1.7 Mb |
| Document Language | English |
HT45B3305H. CAN Bus Controller. Power-on Reset Characteristics. Test Conditions. Symbol. Parameter. Min. Typ. Max. Unit. VDD. Conditions
Model Line for this Datasheet
Text Version of Document
HT45B3305H HT45B3305H CAN Bus Controller CAN Bus Controller Power-on Reset Characteristics
Ta=-40°C~125°C, unless otherwise specified.
Test Conditions Symbol Parameter Min. Typ. Max. Unit VDD Conditions
VPOR VDD Start Voltage to Ensure Power-on Reset — — — — 100 mV RRPOR VDD Rising Rate to Ensure Power-on Reset — — 0.035 — — V/ms t Minimum Time for VDD Stays at VPOR to Ensure POR Power-on Reset — — 1 — — ms VDD tPOR RRPOR VPOR Time
Power Control Function
The device operating clock is from an external crystal oscillator, HXT. The oscillator can be enabled or disabled using a register bit HXTEN. The clock which is a divided version of the system clock can be output on the CLKOUT pin.
CLKOUT Pin
The clock output pin, CLKOUT is provided to the users for use as a clock input for other devices. The CLKOUT pin has an internal prescaler which can devide fSYS by 1, 2, 4 and 8. The prescaler is selected via the FOCFG register. When clearing the HXTEN bit in the FOCFG register (ADDRESS C0H) to zero, the HXT oscillator is off thus turning off the CLKOUT clock output. FODIV1~FODIV0 fSYS Oscillator fSYS/2 fSYS f HXT Prescaler CLKO CLKOUT fSYS/4 fSYS/8 HXTEN fCAN C_CAN CANEN fSYS SPI Writer Buffer & fSYS Data Check I2C
IDLE Mode
The IDLE Mode is entered when the HXTEN bit in the FOCFG register is high while the CANEN bit in the CANCFG register is low. In the IDLE Mode the HXT oscillator is continue to provide a clock. The C_CAN is disabled. Rev. 1.00 8 December 25, 2019 Rev. 1.00 9 December 25, 2019 Document Outline Features Applications General Description Block Diagram Pin Assignment Pin Description Absolute Maximum Ratings D.C. Characteristics A.C. Characteristics System Frequency Characteristics Timing Characteristics Operating Voltage Characteristics Operating Current Characteristics Standby Current Characteristics CAN Electrical Characteristics Power-on Reset Characteristics Power Control Function CLKOUT Pin IDLE Mode SLEEP Mode and Wake-up Functional Description Write Buffer and Data Check SPI and I2C Frame Fields SPI Serial Interface I2C Serial Interface HT45B3305H CAN Block Diagram Interrupt Output Pins Message RAM and FIFO Buffer Configuration HT45B3305H CAN Operating Modes CAN Application Register Description Register Map Register Reset Condition Register Description Application Circuits SPI Serial Interface I2C Serial Interface Package Information 16-pin NSOP (150mil) Outline Dimensions SAW Type 16-pin QFN (3mm×3mm for FP0.25mm) Outline Dimensions
Ta=-40°C~125°C, unless otherwise specified.
Test Conditions Symbol Parameter Min. Typ. Max. Unit VDD Conditions
VPOR VDD Start Voltage to Ensure Power-on Reset — — — — 100 mV RRPOR VDD Rising Rate to Ensure Power-on Reset — — 0.035 — — V/ms t Minimum Time for VDD Stays at VPOR to Ensure POR Power-on Reset — — 1 — — ms VDD tPOR RRPOR VPOR Time
Power Control Function
The device operating clock is from an external crystal oscillator, HXT. The oscillator can be enabled or disabled using a register bit HXTEN. The clock which is a divided version of the system clock can be output on the CLKOUT pin.
CLKOUT Pin
The clock output pin, CLKOUT is provided to the users for use as a clock input for other devices. The CLKOUT pin has an internal prescaler which can devide fSYS by 1, 2, 4 and 8. The prescaler is selected via the FOCFG register. When clearing the HXTEN bit in the FOCFG register (ADDRESS C0H) to zero, the HXT oscillator is off thus turning off the CLKOUT clock output. FODIV1~FODIV0 fSYS Oscillator fSYS/2 fSYS f HXT Prescaler CLKO CLKOUT fSYS/4 fSYS/8 HXTEN fCAN C_CAN CANEN fSYS SPI Writer Buffer & fSYS Data Check I2C
IDLE Mode
The IDLE Mode is entered when the HXTEN bit in the FOCFG register is high while the CANEN bit in the CANCFG register is low. In the IDLE Mode the HXT oscillator is continue to provide a clock. The C_CAN is disabled. Rev. 1.00 8 December 25, 2019 Rev. 1.00 9 December 25, 2019 Document Outline Features Applications General Description Block Diagram Pin Assignment Pin Description Absolute Maximum Ratings D.C. Characteristics A.C. Characteristics System Frequency Characteristics Timing Characteristics Operating Voltage Characteristics Operating Current Characteristics Standby Current Characteristics CAN Electrical Characteristics Power-on Reset Characteristics Power Control Function CLKOUT Pin IDLE Mode SLEEP Mode and Wake-up Functional Description Write Buffer and Data Check SPI and I2C Frame Fields SPI Serial Interface I2C Serial Interface HT45B3305H CAN Block Diagram Interrupt Output Pins Message RAM and FIFO Buffer Configuration HT45B3305H CAN Operating Modes CAN Application Register Description Register Map Register Reset Condition Register Description Application Circuits SPI Serial Interface I2C Serial Interface Package Information 16-pin NSOP (150mil) Outline Dimensions SAW Type 16-pin QFN (3mm×3mm for FP0.25mm) Outline Dimensions
