Datasheet TC1321 (Microchip) - 5

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TC1321 2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1: PIN FUNCTION TABLE Pin Number Pin Name Type Description
1 VREF Input Voltage Reference Input Pin 2 SDA Bi-Directional Serial Data Input/Output Pin 3 SCL Input Serial Clock Input Pin 4 VSS Power Ground Reference Pin 5 VOUT Output Buffered Analog Voltage Output Pin 6 NC None No connection 7 DAC-OUT Output Unbuffered Analog Voltage Output Pin 8 VDD Power Positive Power Supply Input Pin
2.1 External Voltage Reference Input 2.6 No Connection (NC) (VREF)
There is not a connection at this pin. Voltage Reference Input can range from 0V to 1.2V below VDD.
2.7 Output (DAC-OUT) 2.2 Bi-Directional Serial Data Input
Unbuffered DAC output voltage. This voltage is a function of the reference voltage and the contents of
and Output (SDA)
the DATA register. This output is unbuffered and care Serial data is transferred on the SMBus in both must be taken that the pin is connected only to a directions using this pin. high-impedance node.
2.3 Serial Clock Input (SCL) 2.8 Positive Power Supply Input (VDD)
SMBus/I2C serial clock. Clocks data into and out of the See the Electrical Specifications table. TC1321.
2.4 Supply Power Ground (VSS)
The ground reference pin.
2.5 Output (VOUT)
Buffered DAC output voltage. This voltage is a function of the reference voltage and the contents of the DATA register.  2010 Microchip Technology Inc. DS21387C-page 5 Document Outline TC1321 10-Bit Digital-to-Analog Converter with Two-Wire Interface 1.0 Electrical Characteristics 2.0 Pin Descriptions TABLE 2-1: Pin Function Table 2.1 External Voltage Reference Input (VREF) 2.2 Bi-Directional Serial Data Input and Output (SDA) 2.3 Serial Clock Input (SCL) 2.4 Supply Power Ground (VSS) 2.5 Output (VOUT) 2.6 No Connection (NC) 2.7 Output (DAC-OUT) 2.8 Positive Power Supply Input (VDD) 3.0 Detailed Description 3.1 Reference Input 3.2 Output Amplifier 3.3 Standby Mode TABLE 3-1: Standby Mode Operation 3.4 SMBus Slave Address FIGURE 3-1: SMBus/I2C Protocols. 4.0 Serial Port Operation TABLE 4-1: TC1321 Serial Bus Conventions 4.1 START Condition (START) 4.2 Address Byte 4.3 Acknowledge (ACK) 4.4 Data Byte 4.5 Stop Condition (STOP) FIGURE 4-1: SMBus/I2CTiming Diagrams. 4.6 Register Set and Programmer’s Model TABLE 4-2: TC1321 Command Set (READ_BYTE and WRITE_BYTE) TABLE 4-3: Configuration Register (CONFIG), 8-Bit, Read/Write TABLE 4-4: Data Register (DATA), 10-Bit, Read/Write 4.7 Register Set Summary TABLE 4-5: TC1321 Register Set Summary 5.0 Packaging Information 5.1 Package Marking Information Appendix A: Revision History Product Identification System Worldwide Sales and Service