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• AC to DC Converter ( ❋ Items in this solution Δ Other related products)
  Part Number Input Volt. Start / Operate Current Topology Power MOS OTHERS Power PACKAGE
  HT7A6322 9 ~ 38V - / 0.7mA Flyback Isolation 730V 12Ω UVLO, OTP, OVP, OCP 20W 8NSOP/DIP
• 2-Line Communication IC ( ❋ Items in this solution Δ Other related products)
  Part Number VDD Interface LDO Regulator PACKAGE
  HT45B0003 12 ~ 42V M-BUS Like 3.0V 8NSOP
HT45B0005 12 ~ 42V M-BUS Like 5.0V 8NSOP
  HT45FB721 12 ~ 42V M-BUS 5.0V 8NSOP
• Standard MCU with UART( ❋ Items in this solution Δ Other related products)
  Part Number VDD IO / ADC Interface TIMER ROM/RAM/EEP CLOCK OTHERS PACKAGE
HT66F0082 2.2 ~ 5.5V 26 / 12-bitx8 SPI/UART 6 4KW / 128 / 64 2% HIRC Simple LCD, LED driver 20SSOP
  HT68FU60 2.2 ~ 5.5V 50 / 12-bitx9 UART 4 12KW / 576 / 256     20SSOP
  HT85F2280 2.2 ~ 5.5V 48 / 12-bitx9 SPI/UART/I²C 4 64KB / 2K / - 2% HIRC 1T 8051, T-Sensor, PLL 48/64LQFP
  HT32F52352 2.0 ~ 3.6V 51 / 12-bitx12 UART/SPI/I²C/USB/EBI 7 128KB / 16K / -   1MHz ADC, I²2, CRC, T-Sensor 48/64LQFP
• LCD or LED Driver( ❋ Items in this solution Δ Other related products)
  Part Number VDD Max Resolution Interface Row Current Com Current Key Scan PACKAGE
  HT16C21 2.4 ~ 5.5V 44x4 I²C       48/52LQFP
HT16C24 2.4 ~ 5.5V 72x4,68x8,60x16 I²C       64/80LQFP
  HT16K23 2.4 ~ 5.5V 16 x 8 I²C     16x1 28SOP
  HT1635B 4.5 ~ 5.5V 44x8 I²C 50mA 250mA   64LQFP
  HT16K33 4.5 ~ 5.5V 16x8,12x8,8x8 I²C 20mA 160mA 13x3,10x3,8x3 20/24/28SOP
• HT8 Series 2-Line Communication MCU( ❋ Items in this solution Δ Other related products)
  Part Number VDD IO / ADC Interface TIMER ROM/RAM/EEP CLOCK OTHERS LDO Regulator PACKAGE
HT45F2002 12 ~ 42V 18 / - - 2 4K / 128 / 64 2% HIRC M-Bus Like Interface 5.0V 20SSOP
  HT45F2003 12 ~ 42V 18 / - I²C 2 4K / 128 / 64 2% HIRC M-Bus Like Interface 3.0V 20SSOP

Holtek has released a low speed, long distance data transmission MCU with a wide range 9V~42V operating voltage and an integrated voltage regulator. This MCU can be used in water meters, gas meters and other similar products. Holtek provides a practical reference solution to help users to develop such products rapidly.

Water meters or other similar products, which often need remote automatic reading, are usually several kilometers away from the host and have no power supply. In this case, the RS485 bus that has power and supports remote communication is used in such applications. Due to the expensive RS485 cables and numerous meters, a solution with lower costs and a more convenient wiring scheme is required. The optical direct reading type is still the most popular type among numerous types of water meters. Refer to “Optical Direct Reading Remote Water Meter Solution”.
Additionally, Holtek also provides an emulation host for users to conveniently build a complete system for evaluation.

The associated technical documents can be obtained when linking to the left side diagram. Holtek also provides users with all required technical support related to the emulation host, including circuits, host software and PCBs, etc.

1

Application Areas

Water meters, gas meters, etc., which use optical direct reading and require remote reading.

2

2-wire high voltage power and data transfer

Only a single IC and some simple rectification and current-limiting components are required to implement a complete meter which includes optical emission and detection functions.

3

Lower cable and installation costs

Only 2 wires are required for both the power supply and data transfer reducing the cabling costs. Online distance can be up to several kilometers and more than 256 meters can be connected.

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System Architecture and Connection Diagram

In water flow-driven mechanical water meters, an IR LED transmitter and receiver are usually embedded into the disk structure to implement a remote reading function. Using general non-isolated cables combined with a voltage above 26V and a bus parallel mode like MBUS, the system online distance can be up to 1 kilometer or more and more than 250 meters can be connected.

Based on the above market requirements, Holtek provides the HT45F2002 which includes an IR LED transmitter and receiver, a voltage regulator and a high voltage bus transmission functions. To implement a 2-wire bus system for power supply and carrier transmission, each water meter’s average power consumption in this solution can be controlled at 1mA.

This solution also includes an emulation host for development evaluation. Its communication protocol and IR LED optical direct reading principles described in this page can be downloaded. Move the mouse to view the images or download the items required.

(C90001-A.ZIP) Remote reading meter emulation host
Description Files   Solution Description and Application Notes
Application Circuits Protel format
PCB Protel format
Block Diagram PDF
Code Source code
Component List   Excel format
(C90001-B.ZIP) Optical direct reading remote water meter
Description Files   Solution Description and Application Notes
Application Circuits Protel format
PCB Protel format
Block Diagram PDF
Code Source code
Component List   Excel format
(C90001-B.ZIP) Optical direct reading remote water meter
Description Files   Solution Description and Application Notes
Application Circuits Protel format
PCB Protel format
Block Diagram PDF
Code Source code
Component List   Excel format
(C90001-C.ZIP) Remote wiring simulation board(RC network)
Description Files   Solution Description and Application Notes
Application Circuits   Protel format
PCB Protel format
Block Diagram   PDF
Code   Source code
Component List   Excel format
(C90001-C.ZIP) Remote wiring simulation board(RC network)
Description Files   Solution Description and Application Notes
Application Circuits   Protel format
PCB Protel format
Block Diagram   PDF
Code   Source code
Component List   Excel format
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