MC74 ONSEMI | Alldatasheet

Document overview

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Technical content

Features

  • Tested Operating Temperature Range: –40°C to +125°C
  • 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
  • 3.3V and 5.5V Versions Typical Applications
  • Thermal Protection for Hard Disk Drives and Other PC Peripherals
  • Low–Cost Thermostat Controls
  • Power Supplies FUNCTIONAL BLOCK DIAGRAM Internal Sensor (Diode) Serial Port Interface SDA SCL Control Logic /C0068/C0083 Modulator Temperature Register SOT–23–5 SN SUFFIX CASE TBD PRELIMINARY INFORMATION http://onsemi.com Device Package Voltage

ORDERING INFORMATION

MC74A5–33SNTR SOT–23–5 3.3V V DD

3 SCL

SOT–23–5* NOTE: *SOT–23–5 is equivalent to EIAJ–SC74A 2GND VDD 4 SDA5 MC74A5–50T TO–220–5 5.0V V DD PIN CONFIGURATION (Top View) TO–220–5 T SUFFIX CASE TBD PRELIMINARY INFORMATION

http://onsemi.com PIN DESCRIPTION FOR TO–220–5 Pin No. Symbol Type Description ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ NC ÁÁÁÁÁ ÁÁÁÁÁ None ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Not Connected ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ SDA ÁÁÁÁÁ ÁÁÁÁÁ Bi–directional ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ SMBus Serial Data ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ GND ÁÁÁÁÁ ÁÁÁÁÁ Power ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ System Ground ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ SCL ÁÁÁÁÁ ÁÁÁÁÁ Input ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ SMBus Serial Clock ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ VDD ÁÁÁÁÁ ÁÁÁÁÁ Power ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Power Supply Input PIN DESCRIPTION FOR SOT–23–5 Pin No. Symbol Type Description ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ NC ÁÁÁÁÁ ÁÁÁÁÁ None ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Not Connected ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ GND ÁÁÁÁÁ ÁÁÁÁÁ Power ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ System Ground ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ VDD ÁÁÁÁÁ ÁÁÁÁÁ Power ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Power Supply Input ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ SCL ÁÁÁÁÁ ÁÁÁÁÁ Input ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ SMBus Serial Clock ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ SDA ÁÁÁÁÁ ÁÁÁÁÁ Bi–directional ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ SMBus Serial Data PIN DESCRIPTION SCL Input. SMBus serial clock. Clocks data into and out of the MC74. See System Management Bus Specification, rev. 1.0, for timing diagrams. SDA Bi–directional. Serial data is transferred on the SMBus in both directions using this pin. See System Management Bus Specification rev. 1.0 for timing diagrams. VDD Input. Power supply input. See electrical specifications. GND Input. Ground return for all MC74 functions. ABSOLUTE MAXIMUM RATINGS* Symbol Parameter Value Unit VDD Power Supply Voltage 6.0 V Voltage on Any Pin (GND – 0.3 V) to (VDD + 0.3 V) V TA Operating Temperature Range –40 to +125 °C Tstg Storage Temperature Range –65 to +150 °C Current on Any Pin ±50 mA PD Maximum Power Dissipation 330 mW * Maximum Ratings are those values beyond which damage to the device may occur.

http://onsemi.com DC ELECTRICAL CHARACTERISTICS (VDD = 3.3 V or 5.0V (5), –40°C ≤ TA ≤ 125°C, unless otherwise noted.) Symbol Characteristic Min Typ Max Unit Power Supply VPOR Power–On Reset Threshold (VDD Falling Edge or Rising Edge) 1.2 — 2.2 V IDD Operating Current (VDD = 5.5V, Serial Port Inactive) (1) — 200 350 /C0109A IDD–STANDBY Standby Supply Current (VDD = 3.3 V, Serial Port Inactive) (4) — 5.0 10 /C0109A Temperature–to–Bits Converter TERR Temperature Accuracy MC74A +25°C ≤ TA ≤ +85°C 0°C ≤ TA ≤ +125°C –40°C ≤ TA ≤ 0°C –2.0 –3.0 ±2.0 +2.0 +3.0 CR Conversion Rate (2) 4.0 8.0 — sa/sec Serial Port Interface VIH Logic Input High 0.8 x VDD — — V VIL Logic Input Low — — 0.2 x VDD V VOL SDA Output Low IOL = 3 mA (3) IOL = 6 mA (3) 0.4 0.6 V C IN Input Capacitance SDA, SCL — 5.0 — pF ILEAK I/O Leakage –1.0 0.1 1.0 /C0109A 1. Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification. 2. Maximum guaranteed 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 MC74 will cause self–heating and temperature drift error. 4. SDA and SCL must be connected to VDD or GND. 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. SERIAL PORT AC TIMING (VDD = 3.3 V or 5.0V, –40°C ≤ (TA = TJ) ≤ 125°C; CL = 80 pF unless otherwise noted.) Symbol Characteristic Min Typ Max Unit fSMB SMBus Clock Frequency 10 — 100 kHz tLOW Low Clock Period (10% to 10%) 4.7 — — /C0109sec tHIGH High Clock Period (90% to 90%) 4.0 — — /C0109sec tR SMBus Rise Time (10% to 90%) — — 1,000 nsec tF SMBus Fall Time (90% to 10%) — — 300 nsec tSU(START) Start Condition Setup Time (90% SCL to 10% SDA) (for Repeated Start Condition) 4.0 — — /C0109sec tH(START) Start Condition Hold Time 4.0 — — /C0109sec tSU–DATA Data in Setup Time 1,000 — — nsec tH–DATA Data in Hold Time 1,250 — — nsec tSU(STOP) Stop Condition Setup Time 4.0 — — /C0109sec tIDLE Bus Free Time Prior to New Transition 4.7 — — /C0109sec tPOR Power–On Reset Delay (VDD ≥ VPOR (Rising Edge)) — 500 — /C0109sec

http://onsemi.com DETAILED OPERATING DESCRIPTION The MC74 acquires and converts temperature information from its integrated solid state sensor with a basic accuracy 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 MC74, which allows for a multi–sensor configuration. Also, there is low–power Standby mode where temperature acquisition is suspended. Standby Mode The MC74 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. The table below summarizes this operation. Standby Mode Operation SHDN Bit Operating Mode

0 Normal

1 Standby

The MC74 is internally programmed to have a default SMBus address value of 1001 101b. Seven other addresses are available by custom order (contact factory). 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 MC74. The following conventions are used in this bus architecture: MC74 Serial Bus Conventions Term Explanation TransmitterThe 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 pro- vides 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 ValidThe state of SDA must remain stable dur- ing the High period of SCL in order for a data bit to be considered valid. SDA only changes state while SCL is low during nor- mal 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 MC74 always operates as a Slave. The serial protocol is illustrated in Figure 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).

Figure 1. SMBus Protocols

7 Bits

8 Bits

that the command byte is being written. (a LOW to HIGH transition of SDA while SCL is HIGH).

http://onsemi.com AB C D E F G H I J K L M ILOW IHIGH tSU–DATA tH–DATAtSU(START) tH(START) tSU(STOP) tIDLE SCL SDA 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 Slave H = LSB of Data Clocked into Slave I = Slave Pulls SDA Line Low J = Acknowledge Clocked into Master K = Acknowledge Clock Pulse L = Stop Condition, Data Executed by Slave M= New Start Condition AB C D E F G H I J K ILOW IHIGH tSU–DATAtSU(START) tH(START) tSU(STOP) tIDLE SCL SDA 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 I = Acknowledge Clock Pulse J = Stop Condition K = New Start Condition SMBUS Write Timing Diagram SMBUS Read Timing Diagram Figure 2.

*DATA_RDY bit reset at power–up and SHDN enable (see below). Figure 3. . DATA_RDY, SHDN Operation Logic binary value relationship are shown in the following table. A/D converter after the DATA_RDY bit goes high.

http://onsemi.com TAPING FORM PIN 1 USER DIRECTION OF FEED Component Taping Orientation for 5L SOT–23 Devices Standard Reel Component Orientation for TR Suffix Device (Mark Right Side Up) DEVICE MARKING 5L SOT–23 Package Tape Width (W) Pitch (P) Part Per Full Reel Diameter 8 mm 4 mm 3000 7 inches Tape & Reel Specifications Table MARKING SOT–23–5 1234 MC74A5–33SNTR V5 MC74 Marking 1 2 3 4 + Date Code

http://onsemi.com PACKAGE DIMENSIONS SOT–23–5 SNTR SUFFIX PLASTIC PACKAGE CASE TBD ISSUE TBD .037 (0.95) 10 MAX.° REFERENCE .010 (0.25) .020 (0.50) .012 (0.30) .122 (3.10) .098 (2.50) .071 (1.80) 0.75 (1.90) REFERENCE .059 (1.50) .122 (3.10) .106 (2.70) .057 (1.45) .035 (0.90) .006 (0.15) .008 (0.20) .004 (0.09) Dimensions: inches (mm)NOTE: SOT–23–5 is equivalent to EIAJ–SC74A

http://onsemi.com PACKAGE DIMENSIONS TO–220 T SUFFIX PLASTIC PACKAGE CASE TBD ISSUE TBD .410 (10.41) .390 (9.91) .156 (3.96) .146 (3.71) DIA. .113 (2.87) .103 (2.62) .258 (6.55) .230 (5.84) .560 (14.22) .518 (13.16) .560 (14.22) .273 (6.93) .263 (6.68) .072 (1.83) .062 (1.57) .037 (0.94) .027 (0.69) .115 (2.92) .095 (2.41) .020 (0.51) .012 (0.30) .594 (15.09) .569 (14.45) .055 (1.40) .045 (1.14) .185 (4.70) .165 (4.19) 3 – 7.5 5 PLCS. /C0095/C0095 Dimensions: inches (mm)

http://onsemi.com Notes

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