Obsolete Device TC1322 12-Bit Digital-to-Analog Converter with Two-Wire Interface Features General Description • • • • • The TC1322 is a serially accessible 12-bit voltage output digital-to-analog converter (DAC). The DAC produces an output voltage that ranges from ground to an externally supplied reference voltage. It operates from a single power supply that can range from 2.7V to 5.5V, making it ideal for a wide range of applications. Built into the part is a Power-on Reset function that ensures that the device starts at a known condition. 12-Bit Digital-to-Analog Converter 2.7-5.5V Single Supply Operation Simple SMBus/I2CTM Serial Interface Low Power: 350μA Operation, 0.5μA Shutdown 8-Pin SOIC and 8-Pin MSOP Packages Applications • Programmable Voltage Sources • Digital Controlled Amplifiers/Attenuators • Process Monitoring and Control Communication with the TC1322 is accomplished via a simple 2-wire SMBus/I2C compatible serial port with the TC1322 acting as a slave only device. The host can enable the SHDN bit in the CONFIG register to activate the Low Power Standby mode. Device Selection Table Part Number Package Temperature Range TC1322EOA 8-Pin SOIC (Narrow) -40°C to +85°C TC1322EUA 8-Pin MSOP -40°C to +85°C Package Type 8-Pin MSOP and 8-Pin SOIC (Narrow) VREF 1 8 VDD SDA 2 7 DAC-OUT 6 NC 5 VOUT SCL 3 TC1322 GND 4 Typical Application VIN (8) VDD TC1322 – VREF (1) DAC VOUT (5) + VADJUST Serial Port (3) (2) SCLK SDAT Microcontroller © 2005 Microchip Technology Inc. DS21388C-page 1 TC1322 Functional Block Diagram VDD TC1322 Configuration Register SDA SCL Serial Port Interface Data Register Control DAC–OUT VREF DS21388C-page 2 VOUT DAC GND © 2005 Microchip Technology Inc. TC1322 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings* Supply Voltage (VDD) ............................................. +6V *Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Voltage on any Pin .... (GND – 0.3V) to (VDD + 0.3V) Current on any Pin ............................................ ±50mA Package Thermal Resistance (θJA)............ 330°C C/W Operating Temperature (TA)........................ See Below Storage Temperature (TSTG) .............. -65°C to +150°C TC1322 ELECTRICAL SPECIFICATIONS Electrical Characteristics: VDD = 2.7V to 5.5V, -40°C ≤ TA ≤ +85°C, VREF = 1.2V, CL = 80pF, unless otherwise noted. Symbol Parameter Min Typ Max Unit Test Conditions Power Supply VDD Supply Voltage 2.7 — 5.5 — IDD Operating Current — 0.35 0.5 mA VDD = 5.5V, VREF = 1.2V Serial Port Inactive (Note 1) IDD-STANDBY Standby Supply Current — 0.1 1 μA VDD = 3.3V Serial Port Inactive (Note 1) Resolution — — 10 Bits Static Performance - Analog Section INL Integral Non-Linearity at FS, TA = +25°C — — ±16 LSB FSE Full Scale Error — — ±3 %FS DNL Differential Non-Linearity, TA = +25°C — — +4 LSB All Codes (Note 2) VOS Offset Error at VOUT — ±0.3 ±8 mV (Note 2) TCVOS Offset Error Tempco at VOUT — 10 — μv/°C PSRR Power Supply Rejection Ratio — 80 — dB VREF Voltage Reference Range 0 — VDD – 1.2 V IREF Reference Input Leakage Current — — ±1.0 μA (Note 2) VDD at DC VSW Voltage Swing 0 — VREF V VREF ≤ (VDD – 1.2V) ROUT Output Resistance @ VOUT — 5.0 — Ω ROUT (Ω) IOUT Output Current (Source or Sink) — 2 — mA ISC Output Short-Circuit Current VDD = 5.5V — — 30 20 50 50 mA mA — 0.8 — V/μs μsec Source Sink Dynamic Performance SR Voltage Output Slew Rate tSETTLE Output Voltage Full Scale Settling Time — 10 — tWU Wake-up Time — 20 — μs Digital Feed through and Crosstalk — 5 — nV-s SDA = VDD, SCL = 100kHz Serial Port Interface VIH Logic Input High 2.4 — VDD V VIL Logic Input Low — — 0.6 — VOL SDA Output Low — — — — 0.4 0.6 V V CIN Input Capacitance SDA, SCL — 5 0.4 pF ILEAK I/O Leakage — — ±1.0 μA IOL = 3mA (Sinking Current) IOL = 6mA Note 1: SDA and SCL must be connected to VDD or GND. 2: Measured at VOUT ≥ 50mV referred to GND to avoid output buffer clipping. © 2005 Microchip Technology Inc. DS21388C-page 3 TC1322 TC1322 ELECTRICAL SPECIFICATIONS (CONTINUED) Electrical Characteristics: VDD = 2.7V to 5.5V, -40°C ≤ TA ≤ +85°C, VREF = 1.2V, CL = 80pF, unless otherwise noted. Symbol Parameter Min Typ Max Unit Test Conditions Serial Port AC Timing fSMB SMBus Clock Frequency 10 — 100 kHz tIDLE Bus Free Time Prior to New Transition 4.7 — — μsec tH(START) START Condition Hold Time 4.0 — — μsec tSU(START) START Condition Setup Time 4.7 — — μsec tSU(STOP) STOP Condition Setup Time 4.0 — — μsec tH-DATA Data In Hold Time 100 — — nsec tSU-DATA Data In Setup Time 100 — — nsec tLOW Low Clock Period 4.7 — — μsec tHIGH High Clock Period 4 — — μsec 90% to 90% tF SMBus Fall Time — — 300 nsec 90% to 10% tR SMBus Rise Time — — 1000 nsec 10% to 90% tPOR Power-on Reset Delay — 500 — μsec VDD ≥ VPOR (Rising Edge) 90% SCL to 10% SDA (for Repeated START Condition) 10% to 10% Note 1: SDA and SCL must be connected to VDD or GND. 2: Measured at VOUT ≥ 50mV referred to GND to avoid output buffer clipping. DS21388C-page 4 © 2005 Microchip Technology Inc. TC1322 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin Number Symbol Type 1 VREF Input 2 SDA Bi-Directional Description Input. Voltage Reference Input can range from 0V to 1.2V below VDD. Bi-directional. Serial data is transferred on the SMBus in both directions using this pin. 3 SCL Input 4 GND Power Input. SMBus serial clock. Clocks data into and out of the TC1322. Ground. 5 VOUT Output Output. Buffered DAC output voltage. This voltage is a function of the reference voltage and the contents of the DATA register. 6 NC None 7 DAC-OUT Output Output. Unbuffered DAC output voltage. This voltage is a function of the reference voltage and the contents of the DATA register. This output is unbuffered and care must be taken that the pin is connected only to a high-impedance node. 8 VDD Power Input. Positive power supply input. See electrical specifications. © 2005 Microchip Technology Inc. No connection. DS21388C-page 5 TC1322 3.0 DETAILED DESCRIPTION 3.3 Standby Mode The TC1322 is a monolithic 10-bit digital-to-analog converter 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 (CONFIG), and a current output amplifier. The TC1322 uses an external reference, which also determines the maximum output voltage. The TC1322 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. The TC1322 uses a current steering DAC based on an array of matched current sources. This current, along with a precision resistor, converts the contents of the Data register and VREF into an output voltage, VOUT given by: TABLE 3-1: VOUT = VREF (DATA/4096) 3.1 Reference Input The reference pin, VREF, is a buffered high-impedance input and because of this, the load regulation of the reference source needs only to be able to tolerate leakage levels of current (less than 1μA). VREF accepts a voltage range from 0 to (VDD – 1.2V). Input capacitance is typically 10pF. 3.2 STANDBY MODE OPERATION SHDN Bit 3.4 Operating Mode 0 Normal 1 Standby SMBus Slave Address The TC1322 is internally programmed to have a default SMBus address value of 1001 000b. Seven other addresses are available by custom order (contact factory). See Figure 3-1 for location of address bits in SMBus protocol. Output Amplifier The TC1322 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 10μsec to within ±1/2LSB when loaded with 1kΩ in parallel with 100pF. DS21388C-page 6 © 2005 Microchip Technology Inc. TC1322 FIGURE 3-1: SMBus PROTOCOLS Write 1-Byte Format S Address R/W 0 7-Bits Command ACK ACK 8-Bits Slave Address Data ACK P 8-Bits Command Byte: selects which register you are writing to. Data Byte: data goes into the register set by the command byte. Write 2-Byte Format S Address R/W Command ACK 0 7-Bits ACK 8-Bits Slave Address Data ACK 8-Bits Command Byte: selects which register you are writing to. Data ACK P NACK P 8-Bits Data Byte: data goes into the register set by the command byte. Read 1-Byte Format S Address 7-Bits R/W ACK Command 0 ACK R/W ACK Data Address S 8-Bits 1 7-Bits NACK P 8-Bits Command Byte: selects Slave Address: repeated Data Byte: reads from which register you are due to change in data the register set by the reading from. flow direction. command byte. Slave Address Read 2-Byte Format S Address 7-Bits R/W ACK Command 0 8-Bits ACK 1 7-Bits Command Byte: selects which register you are reading from. Slave Address R/W ACK Data Address S 8-Bits ACK Data 8-Bits Slave Address: repeated Data Byte: reads from due to change in data the register set by the flow direction. command byte. Receive 1-Byte Format S Address 7-Bits R/W ACK 1 Data NACK P 8-Bits S = START Condition Data Byte: reads data from P = STOP Condition the register commanded by Shaded = Slave Transmission the last read byte or write byte transmission. Receive 1-Byte Format S Address 7-Bits R/W ACK 1 Data 8-Bits ACK Data NACK P 8-Bits Data Byte: reads data from S = START Condition the register commanded by P = STOP Condition Shaded = Slave Transmission the last read byte or write byte transmission. © 2005 Microchip Technology Inc. DS21388C-page 7 TC1322 4.0 SERIAL PORT OPERATION 4.1 START Condition (START) The Serial Clock input (SCL) and bi-directional data port (SDA) form a 2-wire bi-directional serial port for programming and interrogating the TC1322. The following conventions are used in this bus architecture: The TC1322 continuously monitors the SDA and SCL lines for a START condition (a HIGH to LOW transition of SDA while SCL is HIGH), and will not respond until this condition is met. TABLE 4-1: 4.2 Term TC1322 SERIAL BUS CONVENTIONS Explanation Transmitter The device sending data to the bus. Receiver The device receiving data from the bus. Master The device which controls the bus: initiating transfers (START), generating the clock, and terminating transfers (STOP). Slave The device addressed by the master. START A unique condition signaling the beginning of a transfer indicated by SDA falling (High - Low) while SCL is high. STOP A unique condition signaling the end of a transfer indicated by SDA rising (Low - High) while SCL is high. ACK A Receiver Acknowledges the receipt of each byte with this unique condition. The Receiver drives SDA low during SCL high of the ACK clock pulse. The Master provides the clock pulse for the ACK cycle. Busy Communication is not possible because the bus is in use. Not Busy When the bus is IDLE, both SDA and SCL will remain high. Data Valid The state of SDA must remain stable during the High period of SCL, in order for a data bit to be considered valid. SDA only changes state while SCL is low during normal data transfers. (See START and STOP conditions.) All transfers take place under control of a host, usually a CPU or microcontroller acting as the Master, which provides the clock signal for all transfers. The TC1322 always operates as a Slave. The serial protocol is illustrated in Figure 3-1. All data transfers have two phases; all bytes are transferred MSB first. Accesses are initiated by a START condition (START), followed by a device address byte and one or more data bytes. The device address byte includes a Read/Write selection bit. Each access must be terminated by a STOP condition (STOP). A convention called Acknowledge (ACK) confirms receipt of each byte. Note that SDA can change only during periods when SCL is LOW (SDA changes while SCL is HIGH are reserved for START and STOP conditions). DS21388C-page 8 Address Byte Immediately following the START condition, the host must transmit the address byte to the TC1322. The 7-bit SMBus address for the TC1322 is 1001000. The 7-bit address transmitted in the serial bit stream must match for the TC1322 to respond with an Acknowledge (indicating the TC1322 is on the bus and ready to accept data). The eighth bit in the Address Byte is a Read-Write bit. This bit is a 1 for a read operation or 0 for a write operation. During the first phase of any transfer, this bit will be set = 0 to indicate that the command byte is being written. 4.3 Acknowledge (ACK) Acknowledge (ACK) provides a positive handshake between the host and the TC1322. The host releases SDA after transmitting eight bits, then generates a ninth clock cycle to allow the TC1322 to pull the SDA line LOW to acknowledge that it successfully received the previous eight bits of data or address. 4.4 Data Byte After a successful ACK of the address byte, the host must transmit the data byte to be written or clock out the data to be read. (See the appropriate timing diagrams.) ACK will be generated after a successful write of a data byte into the TC1322. 4.5 STOP Condition (STOP) Communications must be terminated by a STOP condition (a LOW to HIGH transition of SDA while SCL is HIGH). The STOP Condition must be communicated by the transmitter to the TC1322. Refer to Figure 4-1, Timing Diagrams for serial bus timing. © 2005 Microchip Technology Inc. TC1322 FIGURE 4-1: TIMING DIAGRAMS SMBus Write Timing Diagram A ILOW B C IHIGH D E F G H I K J SCL SDA tSU(START) tH(START) tSU(STOP) tSU-DATA E = Slave Pulls SDA Line Low F = Acknowledge Bit Clocked into Master G = MSB of Data Clocked into Master H = LSB of Data Clocked into Master A = START Condition B = MSB of Address Clocked into Slave C = LSB of Address Clocked into Slave D = R/W Bit Clocked into Slave tIDLE I = Acknowledge Clock Pulse J = STOP Condition K = New START Condition SMBus Read Timing Diagram A ILOW B IHIGH C D E F G H I J K L M SCL SDA tSU(START) tH(START) A = START Condition B = MSB of Address Clocked into Slave C = LSB of Address Clocked into Slave D = R/W Bit Clocked into Slave E = Slave Pulls SDA Line Low © 2005 Microchip Technology Inc. tSU-DATA tH-DATA F = Acknowledge Bit Clocked into Master G = MSB of Data Clocked into Slave H = LSB of Data Clocked into Slave I = Slave Pulls SDA Line Low tSU(STOP) tIDLE J = Acknowledge Clocked into Master K = Acknowledge Clock Pulse L = STOP Condition, Data Executed by Slave M = New START Condition DS21388C-page 9 TC1322 4.6 Register Set and Programmer’s Model TABLE 4-2: TC1322 COMMAND SET (SMBus READ_BYTE AND WRITE_BYTE) TABLE 4-4: Data Register (DATA) for 1st Byte D[11] D[0] D[9] D[8] D[7] D[6] D[5] D[4] MSB X X X X X X LSB Data Register (DATA) for 2nd Byte Command Byte Description Command Code RWD 00h Read/Write Data (DATA) RWCR 01h Read/Write Configuration (CONFIG) TABLE 4-3: Function CONFIGURATION REGISTER (CONFIG), 8-BIT, READ/WRITE D[3] D[2] D[1] D[0] X X X X X X X LSB X X X X The DAC output voltage is a function of reference voltage and the binary value of the contents of the register DATA. The transfer function is given by the expression: EQUATION 4-1: VOUT = VREF x ⎡ DATA ⎤ ⎣ 4096 ⎦ Configuration Register (CONFIG) D[7] D[6] D[5] D[4] D[3] D[2] Reserved Bit POR Function D[0] 0 Standby Switch D[7]-D[1] 0 Reserved; Always returns Zero when Read D[1] D[0] SHDN Type Operation Read/ 1 = Standby Write 0 = Normal N/A DATA REGISTER (DATA), 12-BIT, READ/WRITE N/A 4.7 Register Set Summary The TC1322’s register set is summarized in Table 4-5 below. All registers are 12-bits wide. TABLE 4-5: Name Data TC1322 REGISTER SET SUMMARY Description Data Register (2-Byte Format) POR State 000000000000b Config CONFIG Register 0000 0000b DS21388C-page 10 Read Write X X X X © 2005 Microchip Technology Inc. TC1322 5.0 PACKAGING INFORMATION 5.1 Package Marking Information Package marking data not available at this time. 5.2 Taping Forms Component Taping Orientation for 8-Pin MSOP Devices User Direction of Feed PIN 1 W P Standard Reel Component Orientation for TR Suffix Device Carrier Tape, Number of Components Per Reel and Reel Size Package 8-Pin MSOP Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 12 mm 8 mm 2500 13 in Component Taping Orientation for 8-Pin SOIC (Narrow) Devices User Direction of Feed PIN 1 W P Standard Reel Component Orientation for TR Suffix Device Carrier Tape, Number of Components Per Reel and Reel Size Package 8-Pin SOIC (N) © 2005 Microchip Technology Inc. Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 12 mm 8 mm 2500 13 in DS21388C-page 11 TC1322 5.3 Package Dimensions 8-Pin MSOP PIN 1 .122 (3.10) .114 (2.90) .197 (5.00) .189 (4.80) .026 (0.65) TYP. .122 (3.10) .114 (2.90) .043 (1.10) MAX. .016 (0.40) .010 (0.25) .008 (0.20) .005 (0.13) 6° MAX. .006 (0.15) .002 (0.05) .028 (0.70) .016 (0.40) Dimensions: inches (mm) 8-Pin SOIC PIN 1 .157 (3.99) .150 (3.81) .244 (6.20) .228 (5.79) .050 (1.27) TYP. .197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) .010 (0.25) .007 (0.18) 8° MAX.. .050 (1.27) .016 (0.40) Dimensions: inches (mm) DS21388C-page 12 © 2005 Microchip Technology Inc. TC1322 NOTES: © 2005 Microchip Technology Inc. DS21388C-page 13 TC1322 SALES AND SUPPORT Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 The Microchip Worldwide Site (www.microchip.com) Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products. DS21388C-page 14 © 2005 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. • Microchip is willing to work with the customer who is concerned about the integrity of their code. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.” Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. 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SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2005, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received ISO/TS-16949:2002 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona and Mountain View, California in October 2003. The Company’s quality system processes and procedures are for its PICmicro® 8-bit MCUs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified. © 2005 Microchip Technology Inc. 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