Product Specs

ManualsBrandsMCTHINGS ManualsElectronicsIOT Sensor

2.12 I2C Interface

There is a dedicated I2C communications interface on pins SCL and SDA. This interface bus is shared

with the accelerometer (Address 0x19) and temperature sensor (Address 0x48). There are 10kΩ pull-ups

on included on the module. The parameters of the I2C interface are shown in Table 3-6.

Table 3-6: I2C Parameters

Parameter

Value

SCL Pin

SCL

SDA PIN

SDA

Data Rates

100kHz & 400 kHz

Pull

ups (On Module)

10k

Ω

Unavailable Addresses

0x19, 0x48

An example of I2C communications is shown in Figure 3-16.

01 Class Temperature

2 Shared Function GetTemp() As Float

3 Dim sensor As I2c

4 sensor = I2c.Create(400000, Pin.SCL, Pin.SDA, 0x48)

5 Device.EnableTempSensor()

6 Thread.Sleep(40000) // See page 13 of the datasheet

7 Dim res As ListOfByte = sensor.Read(2)

8 Dim temp As Float = Float.NaN

9 If res <> Nothing Then

Dim part As

Float = res(1) >> 4

part = part

/ 16

temp = res(0).SignExtend() + part

13 End If

14 Device.DisableTempSensor()

15 Return temp

16 End Function

17 End Class

Figure 3-16: I2C mc-Script

2.13 PWM

The module contains a hardware PWM (Pulse Width Modulation) peripheral with the parameters specified

in Table 3-7. There are 3 PWM modules each with 4 channels per module. All channels using the same PWM

module MUST be the same frequency but their polarity and duty cycle may be changed.

The three things that define a PWM signal are the Pin, Period and Duty cycle. The pin specifies where

the PWM signal is sent to, the Period is the amount of time between the rising edges of the signal in

µSec and the duty cycle is the time that the pulse is active in µSec. So to create a pulse of 1Khz and a

duty cycle of 20% the user has to specify a 1000 µSec Period and a 200 µSec Duty Cycle. If the duty cycle

is 0 or negative the signal is always low and if the duty cycle is equal or larger than the period, the signal

is always high.