MCP4725DM-PTPLS Microchip Technology, MCP4725DM-PTPLS Datasheet - Page 12

• Manufacturer Part Number: MCP4725DM-PTPLS
• Description: BOARD DAUGHTER PICTAIL MCP4725
• Manufacturer: Microchip Technology

Specifications of MCP4725DM-PTPLS

• Number Of Dac's: 1
• Number Of Bits: 12
• Outputs And Type: 1, Single Ended
• Sampling Rate (per Second): 100k ~ 3.4M
• Data Interface: I²C
• Settling Time: 6µs
• Dac Type: Voltage
• Voltage Supply Source: Single
• Operating Temperature: -40°C ~ 125°C
• Utilized Ic / Part: MCP4725
• Silicon Manufacturer: Microchip
• Application Sub Type: DAC
• Kit Application Type: Data Converter
• Silicon Core Number: MCP4725
• Silicon Family Name: PICtail
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MCP4725 PICtail™ Plus Daughter Board User’s Guide
DS51722A-page 8
1.3.2.2
Figure 1-5 shows the flow chart of the firmware. Once the MCU firmware is pro-
grammed, the user can observe the following events:
1. V
2. Audible sounds (Buzzer) if JP4 is connected.
3. I
1.3.3
The MCU sends write commands for EEPROM and DAC input register.
The MCU writes EEPROM only once, but writes continuously the DAC input register.
The EEPROM is written for the V
ously written for the V
“FFFh” with 1 LSB increment. When it reaches “FFFh”, resets to “000h” and repeats the
writing from “000h” to “FFFh” with 1 LSB again.
The user can observe the V
oscilloscope. Figure 1-7 shows the I
output waveform.
The DAC input register is written with fast mode write command which does not affect
the EEPROM. The user can confirm the data written in EEPROM (V
disconnecting the MCP4725 PICtail™ Plus Daughter Board from the Explorer 16
Development Board. When the board is first powered, the MCP4725 device loads the
EEPROM data to the DAC input register by itself and then outputs an analog voltage
determined by the EEPROM data.
1.3.4
The MCP4725 PICtail™ Plus Daughter Board includes a buzzer. This buzzer is directly
connected to the V
buzzer sounds also can be adjusted by VR1.
waveform.
Figure 1-6 and Figure 1-7.
2
OUT
C data communication (SDA and SCL) waveform over the I
changes as the MCU rewrites the DAC codes. See Figure 1-6 for the V
DAC Output (V
Audible Buzzer
FIRMWARE FLOW CHART FOR THE MCP4725 DAUGHTER BOARD
OUT
OUT
. The user can disable the buzzer by disconnecting JP4. The
to be ramp: The DAC input code is written from “000h” to
OUT
OUT
)
at the V
OUT
2
C clock (SCL) and data (SDA) signals, and DAC
= V
OUT
DD
/2, and the DAC input register is continu-
test pin using a digital voltmeter or
© 2008 Microchip Technology Inc.
2
C bus line. See
OUT
= V
DD
/2) by
OUT