Shulou(Shulou.com)06/02 Report--

Godson 1D is a special SoC chip for ultrasonic heat meter, water meter and gas meter measurement. The chip integrates ultrasonic time measurement, ultrasonic pulse generator, temperature measurement unit, CPU, serial port, infrared transceiver, segment LCD controller, voltage detection unit, air traffic control detection unit, ultrasonic transducer break detection and other functional components. With perfect programming, simulation and debugging environment, the software and hardware design of ultrasonic heat meter measurement system will be greatly simplified.

Godson 1D structure diagram:

Godson 1D is composed of measurement module, processor subsystem, power management module and display module, which is connected by AXI and APB bus. The processor subsystem includes the processor core and the modules that need to be controlled by software, such as Flash and SPI, whose power can be completely turned off to save power consumption.

The structure of Godson 1D measurement module is shown in the following figure:

1.3 document convention

1.3.1 signal naming

The selection of signal name is based on the principle of convenient memory and clear identification function. The low effective signal ends with n, while the high effective signal does not take n. Pin signal names that can be reused as GPIO are suffixed with / GPIO

1.3.2 signal type

1.3.3 numerical representation

Hexadecimal numbers are expressed as' hxxx,2 binary numbers are represented as' bxx', and other numbers are represented in decimal.

The function is the same but the label has other pins (such as LCD_SEG0, LCD_SEG1, … Abbreviated in square brackets plus a range of numbers (such as LCD_SEG [14:0]). Similarly, the register domain is represented in this way. To simplify the description, a set of signals is represented in the form of a wildcard "*" (such as SPI_*).

2 pin definition

2.1 Measurement Interface

2.2SPI interface

2.3UART interface

2.4I2C interface

2.5LCD interface

When LCD is turned off, the above LCD output signal has two types of processing:

1. LCD_SEG [23:20] / GPIO signal is switched to GPIO function

two。 Other output signals are output at low level (EJTAG function is preferred)

If LCD_SEG [23:20] / GPIO does not have a LCD screen connected, the corresponding pin must be configured in GPIO mode

2.6 other interfaces

2.7 system control

2.8 clock

3 Electrical characteristics

3.1 Power supply

3.1.1 recommended working conditions

3.1.2 absolute maximum rating

3.1.3 current consumption

3.2 Interface characteristics

3.2.1 Digital input

3.2.2 Digital output

Note:

1. The output current tested corresponds to the driving capability of IO. See sections 2-10.

3.2.3 ADC input

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