TC74 Tiny Serial Digital Thermal Sensor Features General Description • • • • The TC74 is a serially accessible digital temperature sensor particularly suited for low cost and small formfactor applications. Temperature data is converted from the onboard thermal sensing element and made available as an 8-bit digital word. Digital Temperature Sensing in SOT-23-5 Package Outputs Temperature as an 8-Bit Digital Word Simple Serial Port Interface Solid-State Temperature Sensing: - ±2°C Accuracy from +25°C to +85°C - ±3°C Accuracy from 0°C to +125°C • 3.0 and 5.5V Operating Range • Low Power: - 200µA Operating - 5µA Standby Mode Applications • Thermal Protection for Hard Disk Drives and other PC Peripherals • PC Card Devices for Notebook Computers • Low Cost Thermostat Controls • Power Supplies • Thermistor Replacement Communication with the TC74 is accomplished via a 2wire SMBus/I2C™ compatible serial port. This bus also can be used to implement multi-drop/multi-zone monitoring. The SHDN bit in the CONFIG register can be used to activate the low power Standby mode. Temperature resolution is 1°C. Conversion rate is a nominal 8 samples/sec. Power consumption is only 200µA typ, (5µA Standby, typ). Small size, low installed cost, and ease of use make the TC74 an ideal choice for implementing thermal management in a variety of systems. Functional Block Diagram Internal Sensor (Diode) Package Type Serial Port Interface TO-220 SDA SCL ∆∑ Modulator TC74 Control Logic 1 2 3 4 5 NC SDA GND SCLK VDD Temperature Register SOT-23 SDA SCLK 5 4 TC74 1 2 3 NC GND VDD 2002 Microchip Technology Inc. DS21462B-page 1 TC74 Device Selection Table Part Number Package Address Temperature Range TC74A0-3.3VCT SOT-23A-5 1001 000 -40°C to +125°C TC74A1-3.3VCT SOT-23A-5 1001 001 -40°C to +125°C TC74A2-3.3VCT SOT-23A-5 1001 010 -40°C to +125°C TC74A3-3.3VCT SOT-23A-5 1001 011 -40°C to +125°C TC74A4-3.3VCT SOT-23A-5 1001 100 -40°C to +125°C TC74A5-3.3VCT* SOT-23A-5 1001 101* -40°C to +125°c TC74A6-3.3VCT SOT-23A-5 1001 110 -40°C to +125°C TC74A7-3.3VCT SOT-23A-5 1001 111 -40°C to +125°C TC74A0-5.0VCT SOT-23A-5 1001 000 -40°C to +125°C TC74A1-5.0VCT SOT-23A-5 1001 001 -40°C to +125°C TC74A2-5.0VCT SOT-23A-5 1001 010 -40°C to +125°C TC74A3-5.0VCT SOT-23A-5 1001 011 -40°C to +125°C TC74A4-5.0VCT SOT-23A-5 1001 100 -40°C to +125°C TC74A5-5.0VCT* SOT-23A-5 1001 101 -40°C to +125°C TC74A6-5.0VCT SOT-23A-5 1001 110 -40°C to +125°C TC74A7-5.0VCT SOT-23A-5 1001 111 -40°C to +125°C TC74A0-3.3VAT TO-220-5 1001 000 -40°C to +125°C TC74A1-3.3VAT TO-220-5 1001 001 -40°C to +125°C TC74A2-3.3VAT TO-220-5 1001 010 -40°C to +125°C TC74A3-3.3VAT TO-220-5 1001 011 -40°C to +125°C TC74A4-3.3VAT TO-220-5 1001 100 -40°C to +125°C TC74A5-3.3VAT TO-220-5 1001 101 -40°C to +125°C TC74A6-3.3VAT TO-220-5 1001 110 -40°C to +125°C TC74A7-3.3VAT TO-220-5 1001 111 -40°C to +125°C TC74A0-5.0VAT TO-220-5 1001 000 -40°C to +125°C TC74A1-5.0VAT TO-220-5 1001 001 -40°C to +125°C TC74A2-5.0VAT TO-220-5 1001 010 -40°C to +125°C TC74A3-5.0VAT TO-220-5 1001 011 -40°C to +125°C TC74A4-5.0VAT TO-220-5 1001 100 -40°C to +125°C TC74A5-5.0VAT TO-220-5 1001 101 -40°C to +125°C TC74A6-5.0VAT TO-220-5 1001 110 -40°C to +125°C TC74A7-5.0VAT TO-220-5 1001 111 -40°C to +125°C NOTE: *Default Address. DS21462B-page 2 2002 Microchip Technology Inc. TC74 1.0 ELECTRICAL CHARACTERISTICS *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. Absolute Maximum Ratings* Supply Voltage (V DD) ............................................ +6V Voltage On Any Pin ....... (GND – 0.3V) to (VDD + 0.3V) Current On Any Pin .......................................... ±50 mA Operating Temperature (TA)........................ See Below Storage Temperature (TSTG) .............. -65°C to +150°C TC74 ELECTRICAL SPECIFICATIONS Electrical Characteristics: VDD = 3.3V or 5.0V (Note 5), -40°C ≤ TA ≤ 125°C, unless otherwise noted. Symbol Parameter Min Typ. Max Unit Test Conditions Power Supply VPOR Power-on Reset Threshold 1.2 — 2.2 V VDD Falling Edge or Rising Edge IDD Operating Current — 200 350 µA VDD = 5.5V Serial Port Inactive (Note 1) IDD-STANDBY Standby Supply Current — 5 10 µA VDD = 3.3V Serial Port Inactive (Note 1) Temperature to Bits Converter TERR Temperature Accuracy TC74A -2 -3 — — +2 — +2 °C +25°C <TA < +85°C 0°C < TA < +125°C -40°C < TA < 0°C CR Conversion Rate 4 8 — Sps (Note 2) — — V Serial Port Interface VIH Logic Input High 0.8 x VDD VIL Logic Input Low — — 0.2 x VDD V VOL SDA Output Low — — — — 0.4 0.6 V V CIN Input Capacitance SDA, SCL — 5 — pF ILEAK I/O Leakage -1 0.1 1 µA Note IOL = 3 mA IOL = 6 mA (Note 3) 1: Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification. 2: Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec. 3: Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and temperature drift error. 4: SDA and SCLK must be connected to VDD or GND. 5: VDD = 3.3V for TC74X -3.3VCT. VDD = 5.0V for TC74X -5.0VCT. All part types of the TC74 will operate properly over the wider power supply range of 2.7V to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As VDD varies from the nominal value, accuracy will degrade 1°C/V of VDD change. 2002 Microchip Technology Inc. DS21462B-page 3 TC74 TC74 ELECTRICAL SPECIFICATIONS (CONTINUED) Electrical Characteristics: VDD = 3.3V or 5.0V (Note 5), -40°C ≤ TA ≤ 125°C, CL = 80pF unless otherwise noted. Serial Port AC Timing Symbol Parameter Min Typ. Max Unit Test Conditions fSMB SMBus Clock Frequency 10 — 100 kHz tLOW Low Clock Period 4.7 — — µsec tHIGH High Clock Period 4 — — µsec 90% to 90% tR tF SMBus Rise Time SMBus Fall Time — — — — 1000 300 nsec nsec 10% to 90% 90% to10% tSU(START) START Condition Setup Time (for repeated START Condition) 4 — — µsec 90% SCLK to 10% SDA µsec tH(START) START Condition Hold Time 4 — — tSU-DATA Data In Setup Time 1000 — — nsec tH-DATA Data In Hold Time 1250 — — nsec tSU(STOP) STOP Condition Setup Time 4 — — µsec tIDLE Bus Free Time Prior to New Transition 4.7 — — µsec Power-on Reset Delay — 500 — µsec tPOR Note 10% to 10% VDD ≥ VPOR (Rising Edge) 1: Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification. 2: Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec. 3: Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and temperature drift error. 4: SDA and SCLK must be connected to VDD or GND. 5: VDD = 3.3V for TC74X -3.3VCT. VDD = 5.0V for TC74X -5.0VCT. All part types of the TC74 will operate properly over the wider power supply range of 2.7V to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As VDD varies from the nominal value, accuracy will degrade 1°C/V of VDD change. DS21462B-page 4 2002 Microchip Technology Inc. TC74 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin Number Pin Number (5-Pin SOT-23) (5-Pin TO-220) Symbol Type Description 1 1 NC None 2 3 GND Power System Ground 3 5 VDD Power Power Supply Input 4 4 SCLK Input SMBus Serial Clock 5 2 SDA Bi-directional SMBus Serial Data 2002 Microchip Technology Inc. No Internal Connection. DS21462B-page 5 TC74 Timing Diagrams SMBUS READ Timing Diagram A B IHIGH ILOW C D E F G H I K J SCL SDA tSU(START) tH(START) tSU(STOP) tSU-Data 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 F = Acknowledge Bit Clocked into Master G = MSB of Data Clocked into Master H = LSB of Data Clocked into Master tIDLE I = Acknowledge Clock Pulse J = STOP Condition K = New START Condition SMBUS Write Timing Diagram B A ILOW C D E F G IHIGH 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 DS21462B-page 6 tSU-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 tH-DATA tSU(STOP) tIDLE J = Acknowledge Clocked into Master K = Acknowledge Clock Pulse L = STOP Condition, Data Executed by Slave M = New START Condition 2002 Microchip Technology Inc. TC74 3.0 DETAILED DESCRIPTION 3.1 Functional Description The TC74 acquires and converts temperature information from its onboard solid-state sensor with a resolution of ±1°C. It stores the data in an internal register which is read through the serial port. The system interface is a slave SMBus. The temperature data can be read at any time through the SMBus port. Eight SMBus addresses are programmable for the TC74, which allows for a multi-sensor configuration. Also, there is low power Standby mode when temperature acquisition is suspended. 3.1.1 TABLE 3-1: SHDN Bit STANDBY MODE OPERATION Operating Mode 0 Normal 1 Standby SMBUS SLAVE ADDRESS The TC74 is internally programmed to have a default SMBus address value of 1001 101b. Seven other addresses are available by custom order (contact factory). 3.2 Term Transmitter Receiver Master Slave Serial Port Operation The Serial Clock input (SCL) and bi-directional data port (SDA) form a 2-wire bi-directional serial port for programming and interrogating the TC74. The following conventions are used in this bus architecture: 2002 Microchip Technology Inc. SERIAL BUS CONVENTIONS Explanation The device sending data to the bus. The device receiving data from the bus. The device which controls the bus: initiating transfers (START), generating the clock, and terminating transfers. (STOP) 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. STANDBY MODE The TC74 allows the host to put it into a low power (IDD = 5µA, typical) Standby mode. In this mode, the A/D converter is halted and the temperature data registers are frozen. The SMBus port operates normally. Standby mode is enabled by setting the SHDN bit in the CONFIG register. Table 3-1 summarizes this operation. 3.1.2 TABLE 3-2: 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 TC74 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, 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. 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). DS21462B-page 7 TC74 FIGURE 3-1: SMBUS PROTOCOLS Write Byte Format S Address WR ACK Command 7 Bits ACK Data 8 Bits Slave Address 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. Read Byte Format S Address WR ACK Command 7 Bits ACK S Address 7 Bits 8 Bits Slave Address RD ACK Command Byte: selects which register you are reading from. Data NACK P 8 Bits Slave Address: repeated due to change in dataflow direction. Data Byte: reads from the register set by the command byte. Receive Byte Format S Address RD ACK 7 Bits S = START Condition P = STOP Condition Shaded = Slave Transmission 3.3 Data Nack 8 Bits Data Byte: reads data from the register commanded by the last Read Byte or Write Byte transmission. START Condition (S) The TC74 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. 3.4 3.6 Data Byte After a successful ACK of the address byte, the host must transmit the data byte to be written or clock in the data to be read. (See the appropriate timing diagrams). ACK will be generated after a successful write of a data byte into the TC74. Address Byte Immediately following the START Condition, the host must transmit the address byte to the TC74. The states of A1 and A0 determine the 7-bit SMBus address for the TC74. The 7-bit address transmitted in the serial bit stream must match for the TC74 to respond with an Acknowledge (indicating the TC74 is on the bus and ready to accept data). The 8-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. 3.5 P 3.7 STOP Condition (P) 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 TC74. NOTE: Refer to Timing Diagrams for serial bus timing. Acknowledge (ACK) Acknowledge (ACK) provides a positive handshake between the host and the TC74. The host releases SDA after transmitting 8 bits. The host then generates a ninth clock cycle to allow the TC74 to pull the SDA line LOW. This action acknowledges that the TC74 successfully received the previous eight bits of data or address. DS21462B-page 8 2002 Microchip Technology Inc. TC74 4.0 REGISTER SET AND PROGRAMMER’S MODEL TABLE 4-1: COMMAND BYTE DESCRIPTION (SMBUS READ_BYTE AND WRITE_BYTE) COMMAND CODE FUNCTION RTR 00h Read Temperature (TEMP) RWCR 01h Read/Write Configuration (CONFIG) TABLE 4-3: D D D D D D D D MSB X X X X X X LSB In the temperature data registers, each unit value represents one degree (Celsius). The value is in 2’s complement binary format such that a reading of 0000 0000b corresponds to 0°C. Examples of this temperature to binary value relationship are shown in Table 4-4. TABLE 4-4: TABLE 4-2: BIT POR D 0 CONFIGURATION REGISTER (CONFIG); 8 BITS, READ/ WRITE) FUNCTION STANDBY Switch TYPE OPERATION Read/ Write 1 = standby, 0 = normal D 0 Data Ready* Read Only 1 = ready 0 = not ready D-D 0 Reserved Always returns zero when read N/A N/A REGISTERED TEMP. BINARY HEX +130.00°C +127°C 0111 1111 +127.00°C +127°C 0111 1111 +126.50°C +127°C 0111 1111 +25.25°C +25°C 0001 1001 +0.50°C +1°C 0000 0001 +0.25°C 0°C 0000 0000 0.00°C 0°C 0000 0000 -0.25°C 0°C 0000 0000 -0.50°C 0°C 0000 0000 -0.75°C -1°C 1111 1111 -1.00°C -1°C 1111 1111 -25.00°C -25°C 1110 0111 DATA_RDY, SHDN OPERATION LOGIC DIAGRAM VDD -25.25°C -25°C 1110 0110 -54.75°C -55°C 1100 1001 -55.00°C -55°C 1100 1001 -65.00°C -65°C 1011 1111 4.2 Register Set Summary The TC74 register set is summarized in Table 4-5. All registers are 8 bits wide. DATA_RDY TABLE 4-5: SHDN tconv 4.1 TEMPERATURE TO DIGITAL VALUE CONVERSION (TEMP) ACTUAL TEMP. *Note: DATA_RDY bit RESET at power-up and SHDN enable. FIGURE 4-1: TEMPERATURE REGISTER (TEMP) tconv Temperature Register (TEMP), 8 Bits, READ ONLY The binary value (2’s complement format) in this register represents temperature of the onboard sensor following a conversion cycle. The registers are automatically updated in an alternating manner. 2002 Microchip Technology Inc. TC74 REGISTER SET SUMMARY NAME DESCRIPTION POR State TEMP Internal Sensor Temp. (2’s Complement) 0000 0000b* READ WRITE ✓ CONFIG CONFIG Register 0000 0000b ✓ ✓ *Note: The TEMP resigister will be immediately updated by the A/D converter after the DATA_RDY Bit goes High. DS21462B-page 9 TC74 5.0 PACKAGING INFORMATION 5.1 Package Marking Information TABLE 5-1: PACKAGE MARKING CODES TC74 (V) Code TC74A0-3.3VCT V0 TC74A1-3.3VCT V1 TC74A2-3.3VCT V2 TC74A3-3.3VCT V3 TC74A4-3.3VCT V4 TC74A5-3.3VCT V5 TC74A6-3.3VCT V6 TC74A7-3.3VCT V7 1 & 2 = part number code + temperature range and voltage TC74A0-5.0VCT U0 TC74A1-5.0VCT U1 3 = year and quarter code TC74A2-5.0VCT U2 4 = lot ID number TC74A3-5.0VCT U3 TC74A4-5.0VCT U4 TC74A5-5.0VCT U5 TC74A6-5.0VCT U6 TC74A7-5.0VCT U7 SOT-23 1 DS21462B-page 10 2 3 4 2002 Microchip Technology Inc. TC74 5.2 Taping Forms Component Taping Orientation for 5-Pin SOT-23A (EIAJ SC-74A) Devices User Direction of Feed Device Marking W PIN 1 P Standard Reel Component Orientation TR Suffix Device (Mark Right Side Up) Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 8 mm 4 mm 3000 7 in 5-Pin SOT-23A 5.3 Package Dimensions SOT-23A-5 .075 (1.90) REF. .071 (1.80) .059 (1.50) .122 (3.10) .098 (2.50) .020 (0.50) .012 (0.30) PIN 1 .037 (0.95) REF. .122 (3.10) .106 (2.70) .057 (1.45) .035 (0.90) .006 (0.15) .000 (0.00) .010 (0.25) .004 (0.09) 10° MAX. .024 (0.60) .004 (0.10) Dimensions: inches (mm) 2002 Microchip Technology Inc. DS21462B-page 11 TC74 NOTES: DS21462B-page 12 2002 Microchip Technology Inc. TC74 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. 2002 Microchip Technology Inc. DS21462B-page 13 TC74 NOTES: DS21462B-page 14 2002 Microchip Technology Inc. TC74 Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip’s products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights. 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Le Colleoni 1 20041 Agrate Brianza Milan, Italy Tel: 39-039-65791-1 Fax: 39-039-6899883 United Kingdom Arizona Microchip Technology Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820 03/01/02 *DS21462B* DS21462B-page 16 2002 Microchip Technology Inc.