TCN75A 2-Wire Serial Temperature Sensor Features: Description: • Temperature-to-Digital Converter • Accuracy: - ±1 (typ.) from -40°C to +125°C - ±2°C (max.) from +40°C to +125°C • User-selectable Resolution: 0.5°C to 0.0625°C • Operating Voltage Range: 2.7V to 5.5V • 2-wire Interface: I2C™ Compatible • Operating Current: 200 μA (typ.) • Shutdown Current: 2 μA (max.) • Power-saving One-shot Temperature Measurement • Available Packages: MSOP-8, SOIC-8 Microchip Technology Inc.’s TCN75A digital temperature sensor converts temperatures between -40°C and +125°C to a digital word, with ±1°C (typ.) accuracy. Typical Applications: • • • • • • Personal Computers and Servers Hard Disk Drives and Other PC Peripherals Entertainment Systems Office Equipment Data Communication Equipment General Purpose Temperature Monitoring The TCN75A product comes with user-programmable registers that provide flexibility for temperature-sensing applications. The register settings allow user-selectable, 0.5°C to 0.0625°C temperature measurement resolution, configuration of the power-saving Shutdown and One-shot (single conversion on command while in Shutdown) modes and the specification of both temperature alert output and hysteresis limits. When the temperature changes beyond the specified limits, the TCN75A outputs an alert signal. The user has the option of setting the alert output signal polarity as an active-low or active-high comparator output for thermostat operation, or as temperature event interrupt output for microprocessor-based systems. This sensor has an industry standard 2-wire, I2C™ compatible serial interface, allowing up to eight devices to be controlled in a single serial bus. These features make the TCN75A ideal for low-cost, sophisticated multi-zone temperature-monitoring applications. Package Types Typical Application PIC® SCL 2 R Microcontroller SDA I/O Ports SDA 1 SCL ALERT RPULL-UP VDD 1 SDA VDD 8 2 SCL A0 7 ALERT 3 GND 4 TCN75A 8-Pin SOIC, MSOP VDD 8 VDD 7 A0 6 A1 5 A2 3 ALERT A1 6 4 GND A2 5 TCN75A © 2006 Microchip Technology Inc. DS21935C-page 1 TCN75A 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † VDD ....................................................................... 6.0V Voltage at all Input/Output pins .... GND – 0.3V to 5.5V †Notice: Stresses above those listed under “Maximum ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Storage temperature ..........................-65°C to +150°C Ambient temp. with power applied .....-55°C to +125°C Junction Temperature (TJ).................................. 150°C ESD protection on all pins (HBM:MM)....... (4 kV:400V) Latch-up current at each pin ......................... ±200 mA DC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, and TA = -40°C to +125°C. Parameters Sym Min Typ Max Unit VDD 2.7 — 5.5 V Conditions Power Supply Operating Voltage Range Operating Current IDD — 200 500 μA Continuous operation Shutdown Current ISHDN — 0.1 2 μA Shutdown mode Power-On Reset (POR) Threshold VPOR — 1.7 — V VDD falling edge Δ°C/ΔVDD — 0.2 — °C/V TACY -2 ±1 +2 °C 0.5°C Resolution tCONV — 30 — ms 33 samples/sec (typ.) 0.25°C Resolution tCONV — 60 — ms 17 samples/sec (typ.) 0.125°C Resolution tCONV — 120 — ms 8 samples/sec (typ.) 0.0625°C Resolution tCONV — 240 — ms 4 samples/sec (typ.) High-level Current IOH — — 1 μA VOH = 5V Low-level Voltage VOL — — 0.4 V IOL= 3 mA tRES — 1.4 — s Time to 63% (89°C) 27°C (air) to 125°C (oil bath) Power Supply Rejection VDD = 2.7V to 5.5V Temperature Sensor Accuracy TA = -40°C to +125°C VDD = 3.3V Internal ΣΔ ADC Conversion Time: Alert Output (Open-drain) Thermal Response Response Time DS21935C-page 2 © 2006 Microchip Technology Inc. TCN75A DIGITAL INPUT/OUTPUT PIN CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground and TA = -40°C to +125°C. Parameters Sym Min Typ Max Units Conditions Serial Input/Output (SCL, SDA, A0, A1, A2) Input High-level Voltage VIH 0.7 VDD — — V Low-level Voltage VIL — — 0.3 VDD V Input Current IIN -1 — +1 μA Low-level Voltage VOL — — 0.4 V IOL= 3 mA High-level Current IOH — — 1 μA VOH = 5V VOL = 0.6V Output (SDA) Low-level Current Capacitance IOL 6 — — mA CIN — 10 — pF VHYST 0.05 VDD — — V SDA and SCL Inputs Hysteresis Graphical Symbol Description INPUT OUTPUT Voltage Voltage VDD VDD VIH VOL VIL time time Current Current IOL IIN IOH time time TEMPERATURE CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = +2.7V to +5.5V and GND = Ground. Parameters Sym Min Typ Max Units Specified Temperature Range TA -40 — +125 °C Operating Temperature Range TA -40 — +125 °C Storage Temperature Range TA -65 — +150 °C Thermal Resistance, 8L-SOIC θJA — 163 — °C/W Thermal Resistance, 8L-MSOP θJA — 206 — °C/W Conditions Temperature Ranges Note 1 Thermal Package Resistances Note 1: Operation in this range must not cause TJ to exceed Maximum Junction Temperature (+150°C). © 2006 Microchip Technology Inc. DS21935C-page 3 TCN75A SERIAL INTERFACE TIMING SPECIFICATIONS (NOTE 1) Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, TA = -40°C to +125°C, CL = 80 pF and all limits measured to 50% point. Parameters Sym Min Typ Max Units fSC 0 — 400 kHz Conditions 2 2-Wire I C™ Compatible Interface Serial Port Frequency tSC 2.5 — — μs Low Clock tLOW 1.3 — — μs High Clock tHIGH 0.6 — — μs Rise Time tR 20 — 300 ns 10% to 90% of VDD (SCL, SDA) 90% to 10% of VDD (SCL, SDA) Clock Period tF 20 — 300 ns Data Setup Before SCL High tSU-DATA 0.1 — — μs Data Hold After SCL Low tH-DATA 0 — — μs tSU-START 0.6 — — μs Start Condition Hold Time tH-START 0.6 — — μs Stop Condition Setup Time tSU-STOP 0.6 — — μs tB-FREE 1.3 — — μs Fall Time Start Condition Setup Time Bus Idle Note 1: Specification limits are characterized but not product tested. EE -F R -S TO tB U tS O W tL tH tH Start Condition DS21935C-page 4 AT A -D tH tS U -D AT A tR ,t F SD A SC L tS U IG H P -S TA R T -S TA R T Timing Diagram Data Transmission Stop Condition © 2006 Microchip Technology Inc. TCN75A 2.0 TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. Note: Unless otherwise noted: VDD = 2.7V to 5.5V. 85 105 125 Temperature Accuracy (°C) FIGURE 2-1: Average Temperature Accuracy vs. Ambient Temperature, VDD = 3.3V. 1.0 350 -1.0 VDD = 5.0V VDD = 5.5V 250 200 150 -2.0 100 -3.0 50 -35 -15 5 25 45 TA (°C) 65 85 105 125 FIGURE 2-2: Average Temperature Accuracy vs. Ambient Temperature. 3.0 VDD = 2.7V VDD = 3.3V 300 0.0 -55 Resolution -15 5 25 45 TA (°C) 65 85 105 125 Supply Current vs. Ambient 1 0.8 0.125°C 0.0625°C 0.0 -1.0 0.5°C 0.25°C -2.0 -35 FIGURE 2-5: Temperature. VDD = 3.3V 160 Devices 2.0 1.0 -55 ISHDN (µA) Temperature Accuracy (°C) 400 0.0625°C Resolution 160 Devices VDD = 2.7V VDD = 3.3V VDD = 5.0V VDD = 5.5V 2.0 FIGURE 2-4: Temperature Accuracy Histogram, TA = +25°C. IDD (µA) Temperature Accuracy (°C) 3.0 3.0 65 2.5 25 45 TA (°C) 2.0 5 1.5 -15 1.0 -55 -35 -3.0 -3.0 0.5 -2.0 0.0 -1.0 -0.5 0.0 -1.0 0.0625°C Resolution 160 Devices Specification Limits 5 lots 32 Samples/lot 160 Devices -1.5 1.0 TA = +25°C VDD = 3.3V -2.0 2.0 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% -2.5 VDD = 3.3V Occurrences Temperature Accuracy (°C) 3.0 0.6 0.4 0.2 -3.0 0 -55 -35 -15 5 25 45 TA (°C) 65 85 105 125 FIGURE 2-3: Average Temperature Accuracy vs. Ambient Temperature, VDD = 3.3V. © 2006 Microchip Technology Inc. -55 -35 -15 5 25 45 TA (°C ) 65 85 105 125 FIGURE 2-6: Shutdown Current vs. Ambient Temperature. DS21935C-page 5 TCN75A Note: Unless otherwise noted: VDD = 2.7V to 5.5V. ALERT and SDA I OL (mA) VOL = 0.6V 42 VDD = 5.5V VDD = 3.3V VDD = 2.7V 36 30 24 18 12 6 Average of 10 samples per package 125 105 85 65 SOIC 45 MSOP 25 27°C (Air) to 125°C (Oil bath) 5 -55 -35 -15 5 25 45 TA (°C) 65 85 105 125 FIGURE 2-7: ALERT and SDA IOL vs. Ambient Temperature. 0.4 ALERT and SDA V OL (V) Temperature Data (°C) 145 48 -2 0 FIGURE 2-9: vs. Time. 2 4 6 8 10 12 14 16 18 20 Time (s) TCN75A Thermal Response IOL = 3 mA 0.3 VDD = 5.5V VDD = 3.3V VDD = 2.7V 0.2 0.1 0 -55 -35 -15 5 25 45 TA (°C) 65 85 105 125 FIGURE 2-8: ALERT and SDA Output VOL vs. Ambient Temperature. DS21935C-page 6 © 2006 Microchip Technology Inc. TCN75A 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1. TABLE 3-1: 3.1 PIN FUNCTION TABLE MSOP, SOIC Symbol Function 1 SDA Bidirectional Serial Data 2 SCL Serial Clock Input 3 ALERT 4 GND 5 A2 Address Select Pin (bit 2) 6 A1 Address Select Pin (bit 1) 7 A0 Address Select Pin (bit 0) 8 VDD Power Supply Input Temperature Alert Output Ground Serial Data Pin (SDA) SDA is a bidirectional input/output pin, used to serially transmit data to and from the host controller. This pin requires a pull-up resistor to output data. 3.2 Serial Clock Pin (SCL) SCL is a clock input pin. All communication and timing is relative to the signal on this pin. The clock is generated by the host controller on the bus. 3.3 Power Supply Input (VDD) VDD is the power pin. The operating voltage, as specified in the DC electrical specification table, is applied on this pin. 3.4 Ground (GND) GND is the system ground pin. © 2006 Microchip Technology Inc. 3.5 ALERT Output The TCN75A’s ALERT pin is an open-drain output. The device outputs an alert signal when the ambient temperature goes beyond the user-programmed temperature limit. 3.6 Address Pins (A2, A1, A0) A2, A1 and A0 are device or slave address input pins. The address pins are the Least Significant bits (LSb) of the device address bits. The Most Significant bits (MSb) (A6, A5, A4, A3) are factory-set to <1001>. This is illustrated in Table 3-2. TABLE 3-2: Device TCN75A Note: SLAVE ADDRESS A6 A5 A4 A3 A2 A1 A0 1 0 0 1 X X X User-selectable address is shown by X. DS21935C-page 7 TCN75A 4.0 SERIAL COMMUNICATION 4.1.1 4.1 2-Wire SMBus/Standard Mode I2C™ Protocol-Compatible Interface Data transfers are initiated by a Start condition (START), followed by a 7-bit device address and a read/write bit. An Acknowledge (ACK) from the slave confirms the reception of each byte. Each access must be terminated by a Stop condition (STOP). The TCN75A serial clock input (SCL) and the bidirectional serial data line (SDA) form a 2-wire bidirectional SMBus/Standard mode I2C compatible communication port (refer to the Digital Input/output Pin Characteristics Table and Serial Interface Timing Specifications (Note 1) Table). The following bus protocol has been defined: TABLE 4-1: TCN75A SERIAL BUS PROTOCOL DESCRIPTIONS Term Description Master The device that controls the serial bus, typically a microcontroller. Slave The device addressed by the master, such as the TCN75A. Transmitter Device sending data to the bus. Receiver Device receiving data from the bus. START A unique signal from master to initiate serial interface with a slave. STOP A unique signal from the master to terminate serial interface from a slave. Read/Write A read or write to the TCN75A registers. ACK A receiver Acknowledges (ACK) the reception of each byte by polling the bus. NAK A receiver Not-Acknowledges (NAK) or releases the bus to show End-of-Data (EOD). Busy Communication is not possible because the bus is in use. Not Busy The bus is in the idle state, both SDA and SCL remain high. Data Valid SDA must remain stable before SCL becomes high in order for a data bit to be considered valid. During normal data transfers, SDA only changes state while SCL is low. DS21935C-page 8 DATA TRANSFER Repeated communication is initiated after tB-FREE. This device does not support sequential register read/ write. Each register needs to be addressed using the Register Pointer. This device supports the Receive Protocol. The register can be specified using the pointer for the initial read. Each repeated read or receive begins with a Start condition and address byte. The TCN75A retains the previously selected register. Therefore, it outputs data from the previously-specified register (repeated pointer specification is not necessary). 4.1.2 MASTER/SLAVE The bus is controlled by a master device (typically a microcontroller) that controls the bus access and generates the Start and Stop conditions. The TCN75A is a slave device and does not control other devices in the bus. Both master and slave devices can operate as either transmitter or receiver. However, the master device determines which mode is activated. 4.1.3 START/STOP CONDITION A high-to-low transition of the SDA line (while SCL is high) is the Start condition. All data transfers must be preceded by a Start condition from the master. If a Start condition is generated during data transfer, the TCN75A resets and accepts the new Start condition. A low-to-high transition of the SDA line (while SCL is high) signifies a Stop condition. If a Stop condition is introduced during data transmission, the TCN75A releases the bus. All data transfers are ended by a Stop condition from the master. 4.1.4 ADDRESS BYTE Following the Start condition, the host must transmit an 8-bit address byte to the TCN75A. The address for the TCN75A Temperature Sensor is ‘1001,A2,A1,A0’ in binary, where the A2, A1 and A0 bits are set externally by connecting the corresponding pins to VDD ‘1’ or GND ‘0’. The 7-bit address transmitted in the serial bit stream must match the selected address for the TCN75A to respond with an ACK. Bit 8 in the address byte is a read/write bit. Setting this bit to ‘1’ commands a read operation, while ‘0’ commands a write operation (see Figure 4-1). © 2006 Microchip Technology Inc. TCN75A 4.1.6 Address Byte SCL 1 2 3 4 5 6 7 SDA 1 0 0 1 A2 A1 A0 8 9 A C K Start Address Code Slave Address R/W TCN75A Response FIGURE 4-1: 4.1.5 Device Addressing. DATA VALID After the Start condition, each bit of data in transmission needs to be settled for a time specified by tSU-DATA before SCL toggles from low-to-high (see “Sensor And EEPROM Serial Interface Timing Specifications” on Page 4). © 2006 Microchip Technology Inc. ACKNOWLEDGE (ACK) Each receiving device, when addressed, is obliged to generate an ACK bit after the reception of each byte. The master device must generate an extra clock pulse for ACK to be recognized. The acknowledging device pulls down the SDA line for tSU-DATA before the low-to-high transition of SCL from the master. SDA also needs to remain pulled down for tH-DATA after a high-to-low transition of SCL. During read, the master must signal an End-of-Data (EOD) to the slave by not generating an ACK bit (NAK) once the last bit has been clocked out of the slave. In this case, the slave will leave the data line released to enable the master to generate the Stop condition. DS21935C-page 9 TCN75A 5.0 FUNCTIONAL DESCRIPTION The TCN75A temperature sensor consists of a bandgap type temperature sensor, a ΣΔ Analog-to-Digital Converter (ADC), user-programmable registers and a 2-wire I2C protocol-compatible serial interface. 5.1 The TCN75A uses the difference in the base-emitter voltage of a transistor while its collector current is changed from IC1 to IC2. With this method, the ΔVBE depends only on the ratio of the two currents and the ambient temperature, as shown in Equation 5-1. EQUATION 5-1: Resolution kT One-Shot Shutdown Fault Queue Alert Polarity Δ V BE = ⎛⎝ ------⎞⎠ × ln ( IC 1 ⁄ IC 2 ) q 0.5°C 0.25°C 0.125°C 0.0625°C Where: T = temperature in kelvin ΔVBE = change in diode base-emitter voltage Alert Comp/Int Configuration Register ΣΔ ADC THYST Register Band-Gap Temperature Sensor TSET Register FIGURE 5-1: DS21935C-page 10 k = Boltzmann's constant q = electron charge Temperature Register Register Pointer Temperature Sensor I2C™ Interface Functional Block Diagram. IC1 and IC2 = currents with n:1 ratio 5.2 ΣΔ Analog-to-Digital Converter A Sigma-Delta ADC is used to convert ΔVBE to a digital word that corresponds to the transistor temperature. The converter has an adjustable resolution from 0.5°C (at 30 ms conversion time) to 0.0625°C (at 240 ms conversion time). Thus, it allows the user to make tradeoffs between resolution and conversion time. Refer to Section 5.3.2 “Sensor Configuration Register (CONFIG)” and Section 126.96.36.199 “ΣΔ ADC Resolution” for details. © 2006 Microchip Technology Inc. TCN75A 5.3 Registers Resolution The TCN75A has four registers that are user-accessible. These registers are specified as the Ambient Temperature (TA) register, the Temperature Limit-set (TSET) register, the Temperature Hysteresis (THYST) register and device Configuration (CONFIG) register. One-Shot Shutdown Fault Queue The Ambient Temperature register is a read-only register and is used to access the ambient temperature data. The data from the ADC is loaded in parallel in the register. The Temperature Limit-set and Temperature Hysteresis registers are read/write registers that provide user-programmable temperature limits. If the ambient temperature drifts beyond the programmed limits, the TCN75A outputs an alert signal using the ALERT pin (refer to Section 188.8.131.52 “ALERT Output Configuration”). The device Configuration register provides access for the user to configure the TCN75A’s various features. These registers are described in further detail in the following sections. Alert Polarity Alert Comp/Int Configuration Register THYST Register ALERT Output Control Logic TSET Register The registers are accessed by sending register pointers to the TCN75A using the serial interface. This is an 8-bit pointer. However, the two Least Significant bits (LSbs) are used as pointers and all other bits need to be cleared <0>. This device has additional registers that are reserved for test and calibration. If these registers are accessed, the device may not perform according to the specification. The pointer description is shown below. REGISTER 5-1: ALERT Output Temperature Register FIGURE 4-2: Register Block Diagram. REGISTER POINTER U-0 U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-0 0 0 0 0 0 0 P1 P0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared bit 7-3 Unimplemented: Read as ‘0’ bit 2-0 Pointer bits 00 = Temperature register (TA) 01 = Configuration register (CONFIG) 10 = Temperature Hysteresis register (THYST) 11 = Temperature Limit-set register (TSET) x = Bit is unknown . © 2006 Microchip Technology Inc. DS21935C-page 11 TCN75A TABLE 5-1: Register Pointer P1 P0 MSB/ LSB BIT ASSIGNMENT SUMMARY FOR ALL REGISTERS Bit Assignment 7 Ambient Temperature Register (TA) 00 6 5 4 3 2 1 0 MSB Sign 26°C 25°C 24°C 23°C 22°C 21°C 20°C LSB 2-1°C 2-2°C 2-3°C 2-4°C 0 0 0 0 ALERT Polarity COMP/INT Shutdown Sensor Configuration Register (CONFIG) 01 LSB One-Shot Resolution Temperature Hysteresis Register (THYST) 10 MSB LSB Sign 26°C 25°C 24°C 23°C 22°C 21°C 20°C 0 0 0 0 0 0 0 26°C 25°C 24°C 23°C 22°C 21°C 20°C 0 0 0 0 0 0 0 -1 2 °C Temperature Limit-Set Register (TSET) 11 MSB LSB DS21935C-page 12 Sign -1 2 °C Fault Queue © 2006 Microchip Technology Inc. TCN75A 5.3.1 AMBIENT TEMPERATURE REGISTER (TA) The TCN75A has a 16-bit read-only Ambient Temperature register that contains 9-bit to 12-bit temperature data. (0.5°C to 0.0625°C resolutions, respecively). This data is formatted in two’s complement. The bit assignments, as well as the corresponding resolution, is shown in the register assignment below. conversion in the background. The decimal code to ambient temperature conversion is shown in Equation 5-2: EQUATION 5-2: T A = Code × 2 Where: TA = Ambient Temperature (°C) The refresh rate of this register depends on the selected ADC resolution. It takes 30 ms (typ.) for 9-bit data and 240 ms (typ.) for 12-bit data. Since this register is double-buffered, the user can read the register while the TCN75A performs Analog-to-Digital REGISTER 5-2: –4 Code = TCN75A output in decimal AMBIENT TEMPERATURE REGISTER (TA) - ADDRESS <0000 0000>b Upper Half: R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 Sign 26 °C 25 °C 24 °C 23 °C 22 °C 21 °C 20 °C bit 15 bit 8 Lower Half: R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 2-1 °C/bit 2-2 °C 2-3 °C 2-4 °C 0 0 0 0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared Note 1: x = Bit is unknown When the 0.5°C, 0.25°C or 0.125°C resolutions are selected, bit 6, bit 7 or bit 8 will remain clear <0>, respectively. © 2006 Microchip Technology Inc. DS21935C-page 13 TCN75A 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Note: SCL SDA S 1 0 0 A 2 1 A 1 A A 0 W C K 0 0 0 Address Byte 0 0 0 0 It is not necessary to select the register pointer if it was set from the previous read/write. (see Section 4.1.1) A C K 0 TA Pointer TCN75A TCN75A 1 2 3 4 5 6 7 8 1 0 0 1 A 2 A 1 A 0 R C 1 2 3 4 5 6 7 8 0 0 0 1 1 0 0 1 1 2 3 4 5 6 7 8 0 1 0 0 0 0 0 0 SCL SDA S A K Address Byte A C K P LSB Data MSB Data TCN75A N A K Master Master FIGURE 5-2: Timing Diagram for Reading +25.25°C Temperature from the TA Register (See Section 4.0 “Serial Communication”). DS21935C-page 14 © 2006 Microchip Technology Inc. TCN75A 5.3.2 SENSOR CONFIGURATION REGISTER (CONFIG) The TCN75A has an 8-bit read/write Configuration register that allows the user to select the different features. These features include shutdown, ALERT output select as comparator or interrupt output, ALERT output polarity, fault queue cycle, temperature measurement resolution and One-shot mode (single conversion while in shutdown). These functions are described in detail in the following sections. REGISTER 5-3: R/W-0 CONFIGURATION REGISTER (CONFIG) - ADDRESS <0000 0001>b R/W-0 One-Shot R/W-0 R/W-0 Resolution R/W-0 Fault Queue R/W-0 R/W-0 R/W-0 ALERT Polarity COMP/INT Shutdown bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared bit 7 ONE-SHOT bit 1 = Enabled 0 = Disabled (Power-up default) bit 5-6 ΣΔ ADC RESOLUTION bits 00 = 9 bit or 0.5°C (Power-up default) 01 = 10 bit or 0.25°C 10 = 11 bit or 0.125°C 11 = 12 bit or 0.0625°C bit 3-4 FAULT QUEUE bits 00 = 1 (Power-up default) 01 = 2 10 = 4 11 = 6 bit 2 ALERT POLARITY bit 1 = Active-high 0 = Active-low (Power-up default) bit 1 COMP/INT bit 1 = Interrupt mode 0 = Comparator mode (Power-up default) bit 0 SHUTDOWN bit 1 = Enable 0 = Disable (Power-up default) © 2006 Microchip Technology Inc. x = Bit is unknown DS21935C-page 15 TCN75A • Writing to the CONFIG Register to change the resolution to 0.0625°C <0110 0000>b. 1 2 3 4 5 6 7 8 1 0 0 1 A 2 A 1 A 0 W C 1 2 3 4 5 6 7 8 0 0 0 0 0 0 0 1 SCL SDA S A K Address Byte A C K CONFIG Pointer TCN75A TCN75A 1 2 3 4 5 6 7 8 0 1 1 0 0 0 0 0 1 A C K P MSB Data TCN75A • Reading the CONFIG Register. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Note: SCL SDA S 1 0 0 A 2 1 A 1 A A 0 W C K 0 0 Address Byte 0 0 0 0 0 A C K 1 It is not necessary to select the register pointer if it was set from the previous read/write (see Section 4.1.1). CONFIG Pointer TCN75A TCN75A 1 2 3 4 5 6 7 8 1 0 0 1 A 2 A 1 A 0 R C 1 2 3 4 5 6 7 8 0 1 1 0 0 0 0 0 SCL SDA S A K Address Byte N A K P Data TCN75A FIGURE 5-3: Timing Diagram for Writing and Reading from the Configuration Register (See Section 4.0 “Serial Communication”). DS21935C-page 16 © 2006 Microchip Technology Inc. TCN75A 5.3.3 TEMPERATURE HYSTERESIS REGISTER (THYST) The TCN75A has a 16-bit read/write Temperature Hysteresis register that contains a 9-bit data in two’s compliment format. This register is used to set a hysteresis for the TSET limit. Therefore, the data represents a minimum temperature limit. If the ambient temperature drifts below the specified limit, the TCN75A asserts an alert output (refer to Section 184.108.40.206 “ALERT Output Configuration”). This register uses the nine Most Significant bits (MSbs) and all other bits are don’t cares. The power-up default value of THYST register is 75°C, or <0100 1011 0>b in binary. REGISTER 5-4: TEMPERATURE HYSTERESIS REGISTER (THYST) - ADDRESS <0000 0010>b Upper Half: R/W-0 R/W-1 R/W-0 R/W-0 R/W-1 R/W-0 R/W-1 R/W-1 Sign 26 °C 25 °C 24 °C 23 °C 22 °C 21 °C 20 °C bit 15 bit 8 Lower Half: R/W-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 2-1 °C 0 0 0 0 0 0 0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared © 2006 Microchip Technology Inc. x = Bit is unknown DS21935C-page 17 TCN75A • Writing to the THYST Register to set the temperature hysteresis to 95°C <0101 1111 0000 0000>b. 1 2 3 4 5 6 7 8 1 0 0 1 A 2 A 1 A 0 W C 1 2 3 4 5 6 7 8 0 0 0 0 0 0 1 0 SCL SDA S A K Address Byte A C K THYST Pointer TCN75A TCN75A 1 2 3 4 5 6 7 8 0 1 0 1 1 1 1 1 A C K 1 2 3 4 5 6 7 8 0 0 0 0 0 0 0 0 MSB Data A C K P LSB Data TCN75A TCN75A • Reading the THYST Register. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Note: SCL SDA S 1 0 0 A 2 1 A 1 A A 0 W C K 0 0 0 Address Byte 0 0 0 1 It is not necessary to select the register pointer if it was set from the previous read/write (see Section 4.1.1). A C K 0 THYST Pointer TCN75A TCN75A 1 2 3 4 5 6 7 8 1 0 0 1 A 2 A 1 A 0 R C 1 2 3 4 5 6 7 8 0 1 0 1 1 1 1 1 1 2 3 4 5 6 7 8 0 0 0 0 0 0 0 0 SCL SDA S A K Address Byte A C K P LSB Data MSB Data TCN75A N A K Master Master FIGURE 5-4: Timing Diagram for Writing and Reading from the Temperature Hysteresis Register (See Section 4.0 “Serial Communication”). DS21935C-page 18 © 2006 Microchip Technology Inc. TCN75A 5.3.4 TEMPERATURE LIMIT-SET REGISTER (TSET) The TCN75A has a 16-bit read/write Temperature Limit-Set register (TSET) which contains a 9-bit data in two’s compliment format. This data represents a maximum temperature limit. If the ambient temperature exceeds this specified limit, the TCN75A asserts an alert output. (Refer to Section 220.127.116.11 “ALERT Output Configuration”). This register uses the nine Most Significant bits (MSbs) and all other bits are “don’t cares”. The power-up default value of the TSET register is 80°C, or <0101 0000 0>b in binary. REGISTER 5-5: TEMPERATURE LIMIT-SET REGISTER (TSET) - ADDRESS <0000 0011>b Upper Half: R/W-0 R/W-1 R/W-0 R/W-1 R/W-0 R/W-0 R/W-0 R/W-0 Sign 26 °C 25 °C 24 °C 23 °C 22 °C 21 °C 20 °C bit 15 bit 8 Lower Half: R/W-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 2-1 °C 0 0 0 0 0 0 0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared © 2006 Microchip Technology Inc. x = Bit is unknown DS21935C-page 19 TCN75A • Writing to the TSET Register to set the temperature limit to 90°C, <0101 1010 0000 0000>b 1 2 3 4 5 6 7 8 1 0 0 1 A 2 A 1 A 0 W C 1 2 3 4 5 6 7 8 0 0 0 0 0 0 1 1 SCL SDA S A K Address Byte A C K TSET Pointer TCN75A TCN75A 1 2 3 4 5 6 7 8 0 1 0 1 1 0 1 0 A C K 1 2 3 4 5 6 7 8 0 0 0 0 0 0 0 0 MSB Data A C K P LSB Data TCN75A TCN75A • Reading the TSET Register. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Note: SCL SDA S 1 0 0 A 2 1 A 1 A A 0 W C K 0 0 0 Address Byte 0 0 0 1 It is not necessary to select the register pointer if it was set from the previous read/write. (see Section 4.1.1) A C K 1 TSET Pointer TCN75A TCN75A 1 2 3 4 5 6 7 8 1 0 0 1 A 2 A 1 A 0 R C 1 2 3 4 5 6 7 8 0 1 0 1 1 0 1 0 1 2 3 4 5 6 7 8 0 0 0 0 0 0 0 0 SCL SDA S A K Address Byte A C K P LSB Data MSB Data TCN75A N A K Master Master FIGURE 5-5: Timing Diagram for Writing and Reading from the Temperature Limit-set Register (See Section 4.0 “Serial Communication”). DS21935C-page 20 © 2006 Microchip Technology Inc. TCN75A 18.104.22.168 22.214.171.124 Shutdown Mode The Shutdown mode disables all power-consuming activities (including temperature sampling operations) while leaving the serial interface active. The device consumes 2 μA (max.) in this mode. It remains in this mode until the Configuration register is updated to enable continuous conversion or until power is recycled. In Shutdown mode, the CONFIG, TA, TSET and THYST registers can be read or written to; however, the serial bus activity will increase the shutdown current. 126.96.36.199 One-Shot Mode The TCN75A can also be used in a One-shot mode that can be selected using bit 7 of the CONFIG register. The One-shot mode performs a single temperature measurement and returns to Shutdown mode. This mode is especially useful for low-power applications where temperature is measured upon command from a controller. For example, a 9-bit TA in One-shot mode consumes 200 μA (typ.) for 30 ms and 0.1 μA (typ.) during shutdown. To access this feature, the device needs to initially be in Shutdown mode. This is done by sending a byte to the CONFIG register with bit 0 set <1> and bit 7 cleared <0>. Once the device is in Shutdown mode, the CONFIG register needs to be written to again, with bit 0 and bit 7 set <1>. This begins the single conversion cycle of tCONV, 30ms for 9-bit data. Once the conversion is completed, TA is updated and bit 7 of CONFIG becomes cleared <0> by the TCN75A. TABLE 5-6: SHUTDOWN AND ONE-SHOT MODE DESCRIPTION Operational Mode One-Shot (Bit 7) Shutdown (Bit 0) Continuous Conversion 0 0 Shutdown 0 1 Continuous Conversion 1 0 (One-shot is ignored) One-shot (Note 1) 1 1 Note 1: The shutdown command <01> needs to be programmed before sending a oneshot command <11>. ALERT Output Configuration The ALERT output can be configured as either a comparator output or as Interrupt Output mode using bit 1 of CONFIG. The polarity can also be specified as an active-high or active-low using bit 2 of CONFIG. The following sections describe each output mode, while Figure 5-6 gives a graphical description. 188.8.131.52 Comparator Mode In Comparator mode, the ALERT output is asserted when TA is greater than TSET. The pin remains active until TA is lower than THYST. The Comparator mode is useful for thermostat-type applications, such as turning on a cooling fan or triggering a system shutdown when the temperature exceeds a safe operating range. In Comparator mode, if the device enters the Shutdown mode with asserted ALERT output, the output remains active during shutdown. The device must be operating in continuous conversion, with TA below THYST, for the ALERT output to be deasserted. 184.108.40.206 Interrupt Mode In Interrupt mode, the ALERT output is asserted when TA is greater than TSET. However, the output is deasserted when the user performs a read from any register. This mode is designed for interrupt-driven, microcontrollerbased systems. The microcontroller receiving the interrupt will have to acknowledge the interrupt by reading any register from the TCN75A. This will clear the interrupt and the ALERT pin will become deasserted. When TA drifts below THYST, the TCN75A outputs another interrupt and the controller needs to read a register to deassert the ALERT output. Shutting down the device will also reset, or deassert, the ALERT output. TSET TA THYST ALERT Comparator mode Active-low ALERT Interrupt mode Active-low Register Read * * See Section 220.127.116.11 “Interrupt Mode” FIGURE 5-6: © 2006 Microchip Technology Inc. Alert Output. DS21935C-page 21 TCN75A 18.104.22.168 5.4 Fault Queue The fault queue feature can be used as a filter to lessen the probability of spurious activation of the ALERT pin. TA must remain above TSET for the consecutive number of conversion cycles selected using the Fault Queue bits. Bit 3 and bit 4 of CONFIG can be used to select up to six fault queue cycles. For example, if six fault queues are selected, TA must be greater than TSET for six consecutive conversions before ALERT is asserted as a comparator or an interrupt output. This queue setting also applies for THYST. If six fault queues are selected, TA must remain below THYST for six consecutive conversions before ALERT is deasserted (Comparator mode) or before another interrupt is asserted (Interrupt mode). 22.214.171.124 Summary of Power-up Condition The TCN75A has an internal Power-on Reset (POR) circuit. If the power supply voltage VDD glitches down to the 1.7V (typ.) threshold, the device resets the registers to the power-up default settings. Table 5-2 shows the power-up default summary. TABLE 5-2: Register Data (Hex) TA TSET THYST Pointer 0000 A000 9600 00 CONFIG 00 ΣΔ ADC Resolution The TCN75A provides access to select the ADC resolution from 9-bit to 12-bit (0.5°C to 0.0625°C resolution) using bit 6 and bit 5 of the CONFIG register. The user can gain better insight into the trends and characteristics of the ambient temperature by using a finer resolution. Increasing the resolution also reduces the quantization error. Figure 2-3 shows accuracy versus resolution. Table 5-1 shows the TA register conversion time for the corresponding resolution. TABLE 5-1: POWER-UP DEFAULTS Power-up Defaults 0°C 80°C 75°C Temperature register Continuous Conversion Comparator mode Active-low Output Fault Queue 1 9-bit Resolution At power-up, the TCN75A has an inherent 2 ms (typ.) power-up delay before updating the registers with default values and start a conversion cycle. This delay reduces register corruption due to unsettled power. After power-up, it takes tCONV for the TCN75A to update the TA register with valid temperature data. RESOLUTION AND CONVERSION TIME Bits Resolution tCONV (typ.) 9 10 11 12 0.5 0.25 0.125 0.0625 30 ms 60 ms 120 ms 240 ms DS21935C-page 22 © 2006 Microchip Technology Inc. TCN75A 6.0 APPLICATIONS INFORMATION 6.1 Connecting to the Serial Bus The SDA and SCL serial interface are open-drain pins that require pull-up resistors. This configuration is shown in Figure 6-1. VDD R R TCN75A SDA SCL PIC® MCU The ALERT output can be wire-ORed with a number of other open-drain devices. In such applications, the output needs to be programmed as an active-low output. Most systems will require pull-up resistors for this configuration. 6.3 The TCN75A does not require any additional components besides the master controller in order to measure temperature. However, it is recommended that a decoupling capacitor of 0.1 μF to 1 μF be used between the VDD and GND pins. A high-frequency ceramic capacitor is recommended. It is necessary for the capacitor to be located as close as possible to the power pins in order to provide effective noise protection. 6.4 FIGURE 6-1: Interface. Pull-up Resistors On Serial The TCN75A is designed to meet 0.4V (max.) voltage drop at 3 mA of current. This allows the TCN75A to drive lower values of pull-up resistors and higher bus capacitance. In this application, all devices on the bus must meet the same pull-down current requirements. 6.2 Typical Application Microchip provides several microcontroller product lines with Master Synchronous Serial Port Modules (MSSP) that include the I2C interface mode. This module implements all master and slave functions and simplifies the firmware development overhead. Figure 6-2 shows a typical application using the PIC16F737 as a master to control other Microchip slave products, such as EEPROM, fan speed controllers and the TCN75A temperature sensor connected to the bus. Layout Considerations Thermal Considerations The TCN75A measures temperature by monitoring the voltage of a diode located in the die. A low-impedance thermal path between the die and the Printed Circuit Board (PCB) is provided by the pins. Therefore, the TCN75A effectively monitors the temperature of the PCB. However, the thermal path for the ambient air is not as efficient because the plastic device package functions as a thermal insulator. A potential for self-heating errors can exist if the TCN75A SDA and SCL communication lines are heavily loaded with pull-ups. Typically, the self-heating error is negligible because of the relatively small current consumption of the TCN75A. However, in order to maximize the temperature accuracy, the SDA and SCL pins need to be lightly loaded. SDA SCL PIC16F737 Microcontroller 24LC01 EEPROM TC654 Fan Speed Controller TCN75A Temperature Sensor FIGURE 6-2: Bus. Multiple Devices on I2C™ © 2006 Microchip Technology Inc. DS21935C-page 23 TCN75A 7.0 PACKAGING INFORMATION 7.1 Package Marking Information Example: 8-Lead MSOP N75A/E 645256 XXXXX YWWNNN 8-Lead SOIC (150 mil) XXXXXXXX XXXXYYWW NNN Legend: XX...X Y YY WW NNN e3 * Note: DS21935C-page 24 Example: TCN75AV e3 OA^^0645 256 Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. © 2006 Microchip Technology Inc. TCN75A 8-Lead Plastic Micro Small Outline Package (UA) (MSOP) Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging D N E E1 NOTE 1 1 2 e b A2 A ϕ c L1 A1 Number of Pins Pitch Overall Height Molded Package Standoff Overall Width Molded Package Overall Length Foot Length Footprint Foot Angle Lead Thickness Lead Width Units Dimension Limits N e A Thickness A2 A1 E Width E1 D L L1 ϕ c b MIN — 0.75 0.00 0.40 0° 0.08 0.22 MILLIMETERS NOM 8 0.65 BSC — 0.85 — 4.90 BSC 3.00 BSC 3.00 BSC 0.60 0.95 REF — — — L MAX 1.10 0.95 0.15 0.80 8° 0.23 0.40 Notes: 1. Pin 1 visual index feature may vary, but must be located within the hatched area. 2. Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.15 mm per side. 3. Dimensioning and tolerancing per ASME Y14.5M BSC: Basic Dimension. Theoretically exact value shown without tolerances. REF: Reference Dimension, usually without tolerance, for information purposes only. Microchip Technology Drawing No. C04–111, Sept. 8, 2006 © 2006 Microchip Technology Inc. DS21935C-page 25 TCN75A 8-Lead Plastic Small Outline (OA) – Narrow, 150 mil Body (SOIC) Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging E E1 p D 2 B n 1 h α 45° c A2 A φ β L Units Dimension Limits n p INCHES* NOM 8 .050 .061 .056 .007 .237 .154 .193 .015 .025 4 .009 .017 12 12 MAX MILLIMETERS NOM 8 1.27 1.35 1.55 1.32 1.42 0.10 0.18 5.79 6.02 3.71 3.91 4.80 4.90 0.25 0.38 0.48 0.62 0 4 0.20 0.23 0.33 0.42 0 12 0 12 MAX Number of Pins Pitch Overall Height A .053 .069 1.75 Molded Package Thickness .052 .061 1.55 A2 Standoff § A1 .004 .010 0.25 Overall Width E .228 .244 6.20 Molded Package Width E1 .146 .157 3.99 Overall Length D .189 .197 5.00 Chamfer Distance h .010 .020 0.51 Foot Length L .019 .030 0.76 φ Foot Angle 0 8 8 c Lead Thickness .008 .010 0.25 Lead Width B .013 .020 0.51 α Mold Draft Angle Top 0 15 15 β Mold Draft Angle Bottom 0 15 15 * Controlling Parameter § Significant Characteristic Notes: Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010” (0.254mm) per side. JEDEC Equivalent: MS-012 Drawing No. C04-057 DS21935C-page 26 MIN A1 MIN © 2006 Microchip Technology Inc. TCN75A APPENDIX A: REVISION HISTORY Revision C (November 2006) • • • • • Updated accuracy specification limits Numerous edits throughout data sheet Updated package outline drawings Added disclaimers to package outline drawings Updated package marking information for pb-free markings. Revision B (May 2006) • Revised Product ID System; Added OA713 and UA713 packages. Revision A (January 2005) • Original release of this document. © 2006 Microchip Technology Inc. DS21935C-page 27 TCN75A NOTES: DS21935C-page 28 © 2006 Microchip Technology Inc. TCN75A PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. X /XX Device Temperature Range Package Device: TCN75A: Temperature Sensor Temperature Range: V Package: OA OA713 = = UA UA713 = = = -40°C to +125°C Examples: a) b) TCN75AVOA: TCN75AVOA713: 8LD SOIC package. Tape and Reel, 8LD SOIC package. a) b) TCN75AVUA: TCN75AVUA713: 8LD MSOP package. Tape and Reel, 8LD MSOP package. Plastic SOIC, (150 mil Body), 8-lead Plastic SOIC, (150 mil Body), 8-lead, Tape & Reel Plastic Micro Small Outline (MSOP), 8-lead Plastic Micro Small Outline (MSOP), 8-lead Tape & Reel © 2006 Microchip Technology Inc. DS21935C-page 29 TCN75A NOTES: DS21935C-page 30 © 2006 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. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART, PRO MATE, PowerSmart, rfPIC, and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, Application Maestro, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active Thermistor, Mindi, MiWi, MPASM, MPLIB, MPLINK, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance, UNI/O, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. 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. © 2006, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona, Gresham, Oregon and Mountain View, California. The Company’s quality system processes and procedures are for its PIC® 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. © 2006 Microchip Technology Inc. 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