MCP4728 Microchip Technology Inc., MCP4728 Datasheet - Page 31

• Manufacturer Part Number: MCP4728
• Description: 12-bit, Quad Digital-to-analog Converter With Eeprom Memory
• Manufacturer: Microchip Technology Inc.

5.4
The device acknowledges the general call address
command (0x00 in the first byte). The meaning of the
general call address is always specified in the second
byte. The I
“00000000” (00h) in the second byte. Please refer to
the Philips I
General Call specifications.
The MCP4728 device supports the following I
General Calls:
• General Call Reset
• General Call Wake-Up
• General Call Software Update
• General Call Read Address Bits
FIGURE 5-3:
5.4.2
If the second byte is “00001001” (09h), the device will
reset the Power-Down bits (PD1,PD0 = 0,0).
FIGURE 5-4:
© 2009 Microchip Technology Inc.
Start
Start
I
2
C General Call Commands
2
GENERAL CALL WAKE-UP
1
1
C specification does not allow to use
2
C document for more details of the
Note 1: Resets Power-Down bits at this falling edge of the last ACK clock bit.
Note 1: At this falling edge of the last ACK clock bit:
Data (SDA Line)
Data (SDA Line)
Clock Pulse (CLK Line)
Clock Pulse (CLK Line)
2
2
(General Call Command)
(General Call Command)
General Call Reset.
General Call Wake-Up.
3
3
a. Startup Timer starts a reset sequence and
b. EEPROM data is loaded into the DAC Input and Output Registers immediately.
1st Byte
1st Byte
4
4
5
5
6
6
7
7
8
8
2
C
9
9
1
(Command Type = General Call Wake-Up)
1
5.4.1
The General Call Reset occurs if the second byte is
“00000110” (06h). At the acknowledgement of this
byte, the device will abort the current conversion and
perform the following tasks:
• Internal reset similar to a Power-On-Reset (POR).
• V
(Command Type = General Call Reset)
The contents of the EEPROM are loaded into
each DAC input and output registers immediately.
the LDAC pin condition.
2
2
OUT
3
3
will be available immediately regardless of
GENERAL CALL RESET
ACK (MCP4728)
ACK (MCP4728)
2nd Byte
2nd Byte
4
4
5
5
6
6
MCP4728
7
7
8
DS22187A-page 31
8
9
Note 1
Note 1
9
Stop
Stop