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TC1320EUA 데이터시트(PDF) 6 Page - Microchip Technology |
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TC1320EUA 데이터시트(HTML) 6 Page - Microchip Technology |
6 / 14 page TC1320 DS21386B-page 6 © 2002 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION The TC1320 is a monolithic 8-bit digital-to-analog con- verter, that is designed to operate from a single supply that can range from 2.7V to 5.5V. The DAC consists of a data register (DATA), a configuration register (CONF), and a current output amplifier. The TC1320 uses an external reference, which also determines the maximum output voltage. The TC1320 uses a current steering DAC, based on an array of matched current sources. This current, along a precision resistor, converts the contents of the Data Register and VREF into an output voltage, VOUT given by: VOUT =VREF (DATA/256) 3.1 Reference Input The reference pin, VREF, is a buffered high-impedance input and because of this, the load regulation of the ref- erence source needs only to be able to tolerate leakage levels of current (less than 1 µA). VREF accepts a volt- age range from 0 to (VDD – 1.2V). Input capacitance is typically 10pF. 3.2 Output Amplifier The TC1320 DAC output is buffered with an internal unity gain rail-to-rail input/output amplifier, with a typical slew rate of 0.8V/ µsec. Maximum full scale transition settling time is 10 µsec to within ±1/2LSB when loaded with 1k Ω in parallel with 100pF. 3.3 Standby Mode The TC1320 allows the host to put it into a Low Power (IDD =0.5µA, typical) Standby mode. In this mode, the D/A conversion is halted. The SMBus port operates normally. Standby mode is enabled by setting the SHDN bit in the CONFIG register. The table below summarizes this operation. TABLE 3-1: STANDBY MODE OPERATION 3.4 SMBus Slave Address The TC1320 is internally programmed to have a default SMBus address value of 1001 000b . Seven other addresses are available by custom order (contact fac- tory). See Figure 3-1 for locating address bits in SMBus protocol. FIGURE 3-1: SMBus PROTOCOLS SHDN Bit Operating Mode 0Normal 1 Standby S Address R/W ACK Command ACK Data ACK P 8-Bits 7-Bits 8-Bits Slave Address Command Byte: selects which register you are writing to. Data Byte: data goes into the register set by the command byte. Write 1-Byte Format Read 1-Byte Format S Address R/W ACK Command ACK S Address R/W ACK Data NACK P 7-Bits 8-Bits 7-Bits 8-Bits Slave Address Command Byte: selects which register you are reading from. Slave Address: repeated due to change in data flow direction. Data Byte: reads from the register set by the command byte. Receive 1-Byte Format S Address R/W ACK Data NACK P 7-Bits 1 1 0 0 8-Bits Data Byte: reads data from the register commanded by the last Read Byte or Write Byte transmission. S = START Condition P = STOP Condition Shaded = Slave Transmission |
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