Features • Integrated Temperature Sensor (TS) + 2Kbit Serial EEPROM • Jedec (JC42.4) SO-DIMM SPD + TS compliant • Standard voltage operation Optimized for voltage range: 2.7V to 3.6V • 100khz and 400khz Compatibility 2 • Two-wire Serial Interface: I C/SMBus™ compatible SMBus Timeout supported • Schmitt Trigger, filtered inputs for Noise Suppression • Industry Standard Green (Pb/Halide-free/RoHS Compliant) Package Options 8-pad Very Very Thin DFN (2 x 3 x 0.8mm) Serial EEPROM Features • Permanent and Reversible Software Write Protection for the First-half of the Array Software Procedure to Verify Write Protect Status • Internally organized as one block of 256-bytes (256 x 8) Integrated Temperature Sensor with Serial Electrically-erasable and Programmable Read-only Memory Atmel AT30TSE002B • Supports Byte and Page Write operation Write 1-, 2-, 3-, up to 16-bytes at a time Preliminary • Self-timed Write cycle (5ms max) • High-reliability Endurance: 1 Million Write Cycles Data Retention: 100 years • Low Operating current EEPROM Write ~1.5mA (typ.) EEPROM Read ~ 0.2mA (typ.) Temperature Sensor Features • 11-bit ADC Temp-to-Digital Converter with 0.125°C resolution • Programmable hysteresis threshold: off, 0°C, 1.5°C, 3°C, 6 °C • B-grade Accuracy ±1°C (max.) for +75°C to +95°C ±2°C (max.) for +40°C to +125°C ±3°C (max.) for -20°C to +125°C • Low Operating current Temperature Sensor Active ~ 0.2mA (typ.) 8711D–SEEPR–8/10 Table 0-1. Pin Configuration Pin Name Description A0, A1, A2 Address Inputs SDA Serial Data SCL Serial Clock Input Temperature Alert EVENT GND Ground VCC Power Supply 8-WDFN VCC EVENT SCL SDA 8 7 6 5 1 2 3 4 A0 A1 A2 GND Bottom View Description Atmel® AT30TSE002B is a combination serial EEPROM and temperature sensor device containing 2048-bits of serially electrically-erasable and programmable read only memory (EEPROM) organized as 256-bytes of 8-bits each and could be used to store memory module and vendor information. The EEPROM operation is tailored specifically for DRAM Memory Modules Serial Presence Detect (SPD). The first 128-bytes of the memory incorporate a permanent and a reversible software write protection (WP) feature. Once the permanent software WP is enabled, by sending a special command, it cannot be reversed. However, once the reversible software WP is enabled, it can be reversed by sending a special command. The integrated temperature sensor converts temperatures from -20°C to +125°C to a digital word and provides an accuracy of ±1°C (max.) in the temperature range +75°C to +95°C. The temperature sensor continuously monitors temperature and updates data in the temperature register at least eight times per second. Temperature data is latched internally by the device and may be read by software via a microcontroller at anytime. The AT30TSE002B has flexible user programmable internal registers to configure the temperature sensor performance and response to over temperature conditions. The device contains programmable high, low, and critical temperature limits. The device EVENT pin is configured as active low and can be configured to operate as an interrupt or as a comparator output. Manufacturer and Device ID registers provide the ability to confirm the identity of the device. The AT30TSE002B supports the industry standard 2-wire I2C/ SMBus serial Interface to include time out feature to help prevent system lock-ups. 2 Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM 1. Absolute Maximum Ratings *NOTICE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification are not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Operating Temperature ................ - 40°C to +125°C Storage Temperature ................. - 65°C to + 150°C Voltage on Any Pin with Respect to Ground ......................- 1.0 V +5.0V Pin A0 ..................................................- 1.0 V +12V Maximum Operating Voltage............................ 4.3V DC Output Current ........................................ 5.0mA Figure 1-1. Block Diagram Temperature Sensor Serial EEPROM H.V. Pump/Timing Selected Resolution Temp. Range EEPROM Write Protected Section (00h-7Fh) X Address Decoder EEPROM Second half (80h-FFh) Capability Accuracy Configuration Output Features Critical Alarm Trip EVENT Shutdown Device ID SMBus Manufacturer ID Temperature A/D Converter Upper Alarm Trip Y Address Decoder Lower Alarm Trip Memory Control Logic SMBus Timeout Write Protect Circuitry Band Gap Temperature Sensor Pointer Register Serial Control Logic Vcc GND I2C / SMBus Interface SCLK SDA EVENT A0 A1 A2 3 8711D–SEEPR–8/10 2. Pin Description Atmel® AT30TSE002B requires no external components for operation except for pull-up resistors on SCL, SDA, and EVENT pins. In order to provide effective noise protection and filtering, it is recommended that a decoupling capacitor of 0.1µF be used and is located as close as possible to the device between VCC and ground pins. SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each EEPROM device and negative edge clock data out of each device. SERIAL DATA (SDA): The SDA pin is bidirectional for serial data transfer. This pin is open drain driven and may be wire-ORed with any number of other open-drain or open collector devices. Device Addresses (A2, A1, A0): The A2, A1, and A0 pins are device address inputs that are hardwired (directly to GND or to VCC) for compatibility with two-wire devices. When the pins are hardwired, as many as eight devices may be addressed on a single bus system. A device is selected when a corresponding hardware and software match is true. If these pins are left floating, the A2, A1, and A0 pins will be internally pulled to GND. However, Atmel recommends always connecting the address pins to a known state by direct connection to ground or VCC but if using a pull-up resistor, Atmel recommends using 10k ohm or less. The A0 pin is also overvoltage tolerant, allowing up to 10V for software write protection functionality. (See Section 4 through Section 7) Temperature Alert Output (EVENT ): The EVENT pin outputs a signal when the temperature goes beyond the userprogrammed temperature limits and be configured in one of three modes; either Interrupt, comparator or critical alarm modes. The EVENT Table 2-1. pin is an open-drain output and requires a pull-up resistor for proper operation (see Section 8). Pin Capacitance(1) Applicable over recommended operating range from TA = 25°C, f = 100 kHz, VCC = +3.0V Symbol Test Condition CI/O CIN Note: 4 Max Units Conditions Input/Output Capacitance (SDA), EVENT 8 pF VI/O = 0V Input Capacitance (A0, A1, A2, SCL) 6 pF VIN = 0V 1. This parameter is ensured by characterization only Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM Table 2-2. DC Characteristics Applicable over recommended operating range: TAI = –20°C to +125°C, VCC = +2.7v to +3.6V (unless otherwise noted) Symbol Parameter VCC1 Test Condition Supply Voltage Min Typ 2.7 Max Units 3.6 V Supply Current ICC EEPROM READ VCC = 3.6V (2) 100kHz 0.4 1.0 mA ICC EEPROM WRITE VCC = 3.6V (2) 100kHz 1.5 3.0 mA ICC Temp. Sensor VCC = 3.6V EEPROM inactive 0.2 0.5 mA ICC Timeout active VCC = 3.6V EEPROM inactive, Temp. Sensor shutdown 0.2 0.5 mA ISB Standby Current VCC =3.6V(3) Vin = VHV = or VSS 1.6 4.0 uA ILI Input Leakage Current Vin = VHV = or VSS 0.1 2.0 uA ILO Output Leakage Current Vin = VHV = or VSS 0.1 2.0 uA VIL Input Low Level(1) -0.6 VHV x 0.3 V VIH Input High Level(1) VHV x0.7 VHV + 0.5 V VOL Output Low level VCC = 3.0V 0.4 V VHV High Voltage Input A0 10 V VHYST Input Hysteresis (SDA, SCL) TCONV Temp. Sensor Conversion Time TRES Temp. Sensor Resolution IOL = 2.1mA Pin = A0; VHV - VCC ≥ 4.8V 7 0.05 x VCC V 75 125 0.25 mS °C Temperature Sensor Accuracy TACCUR +75°C < Ta < +95°C -1.0 ±0.5 +1.0 °C TACCUR +40°C < Ta < +125°C -2.0 ±1 +2.0 °C TACCUR -20°C < Ta < +125°C -3.0 ±2 +3.0 °C TCONV Temp. Sensor Conversion Time 75 125 mS TRES Temp. Sensor Resolution Note: 0.25 °C 1. VIL min and VIH max are reference only and are not tested 2. Sensor in Shutdown Mode 3. EEPROM inactive, sensor in shutdown mode 5 8711D–SEEPR–8/10 Table 2-3. AC Characteristics Applicable over recommended operating range: TAI = –20°C to +125°C, VCC = +2.7v to +3.6V, CL = 1 TTL Gate and 100µF (unless otherwise noted) Symbol Min (2) Max Min Max Units 100 (2) 400 kHz FSCL Clock Frequency, SCL 10 TLOW Clock Pulse Width Low 4.7 1.2 us THIGH Clock Pulse Width High 4.0 0.6 us TI Noise Suppression Time(1) TBUF Time the bus must be free before a new transmission can start(1) 4.7 1.2 us THD.STA Start Hold Time 4.0 0.6 us TSU.STA Start Set-up Time 4.7 0.6 us THD.DI Data In Hold Time 0 0.0 us TSU.DAT Data In Set-up Time 200 100 ns TR Inputs Rise Time(1) 1.0 0.3 us TF Inputs Fall Time(1) 300 300 ns TSU.STO Stop Set-up Time 4.7 THD.DAT Data Out Hold Time 200 TWR Write Cycle Time TOUT SMBus Timeout Time EEPROM Endurance(1) 25°C, Page Mode Note: 6 Parameter 10 100 50 0.6 3450 200 5 25 35 25 1 Million ns us 900 ns 5 ms 35 ms Write cycles 1. This parameter is ensured by characterization only 2. The minimum frequency is specified at 10Khz to avoid activating the timeout feature Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM 3. Memory Organization Atmel® AT30TSE002B, 2K Serial EEPROM: The 2K memory is internally organized with 16 pages of 16-bytes each. Random word addressing requires an 8-bit data word address. 4. Device Operation CLOCK and DATA TRANSITIONS: The SDA pin is normally pulled high with an external device. Data on the SDA pin may change only during SCL low time periods. (see Figure 4-4) Data changes during SCL high periods will indicate a start or stop condition as defined below. START CONDITION: A high-to-low transition of SDA with SCL high is a start condition which must precede any other command (see Figure 4-5). STOP CONDITION: A low-to-high transition of SDA with SCL high is a stop condition. After a read sequence, the stop command will place the device in a standby power mode (see Figure 4-5). ACKNOWLEDGE: All addresses and data words are serially transmitted to and from the EEPROM in 8-bit words. The device sends a zero to acknowledge that it has received each word. This happens during the ninth clock cycle. STANDBY MODE: The AT30TSE002B features a low-power standby mode which is enabled: a) Upon power-up b) After the receipt of the STOP bit and the completion of any internal operations. The temperature sensor must be disabled by the user for low-power standby mode. Two-Wire Software Reset: After an interruption in protocol, power loss or system reset, any two-wire part can be reset by following these steps: a) Create a start bit condition b) Clock nine cycles c) Create another start bit followed by stop bit condition as shown below. The device is ready for next communication after the above steps have been completed. Figure 4-1. Two-Wire Software Reset Start Bit SCL Start Bit Dummy Clock Cycles 1 2 3 8 Stop Bit 9 SDA 7 8711D–SEEPR–8/10 Figure 4-2. Bus Timing SCL: Serial Clock SDA: Serial Data I/O tLOW tHIGH SCL tBUF tSU:STO tHD:STA SDA IN tSU:STA SDA input tHD:DI SDA change tSU:DAT STOP condition START condition SCL tHD:DAT SDA OUT Figure 4-3. Data Valid Write Cycle Timing SCL: Serial Clock SDA: Serial Data I/O SCL tSU:STA tSU:STO SDA OUT tW STOP condition 8 Write cycle START condition Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM Figure 4-4. Data Validity Figure 4-5. Start and Stop Condition Figure 4-6. Output Acknowledge 9 8711D–SEEPR–8/10 5. Device Addressing Atmel® AT30TSE002B device requires an 8-bit device address word following a start condition to enable the chip to access either the Temperature Sensor or EEPROM functions (See Table 5-1). Table 5-1. Control/Device Address Word Control / Device Address Word Device Device ID Device Address Bits B7 B6 B5 B4 EEPROM 1 0 1 0 Temperature Sensor 0 0 1 1 EEPROM Write Protection 0 1 1 0 Note: R/W A2 A1 A0 B0 X X X X X = User Selectable The EEPROM device address word consists of a mandatory one-zero sequence for the first four most significant bits (‘1010’) for normal read and write operations, a ‘0110’ for writing to the EEPROM write protect register and ‘0011’ for Temperature Sensor operations. The next three bits are the A2, A1 and A0 device address bits for the AT30TSE002B device. These three bits must match their corresponding hard-wired input pins. The eighth bit of the device address is the read/write operation select bit. A read operation is initiated if this bit is high and an EEPROM write operation is selected if this bit is low. Upon a compare of the device address, the device will output a zero, called an Acknowledge (ACK). If a compare is not made, the chip will not ACK and will return to a standby state. The EEPROM will not ACK if the write protect register has been programmed and the control code is ‘0110’. 6. EEPROM Write Operations BYTE WRITE: A write operation requires an 8-bit data word address following the device address word and ACK. Upon receipt of this address, the EEPROM will again respond with an ACK and then clock in the first 8-bit data word. Following receipt of the 8-bit data word, the EEPROM will output an ACK and the addressing device, such as a microcontroller, must terminate the write sequence with a stop condition. At this time the EEPROM enters an internally timed write cycle, tWR, to the nonvolatile memory. All inputs are disabled during this write cycle and the EEPROM will not respond until the write is complete (see Figure 11-2 and Figure 11-3). The device will acknowledge a write command, but not write the data, if the software write protection has been enabled. The write cycle time must be observed even when the write protection is enabled. PAGE WRITE: The 2K EEPROM device is capable of 16-byte page write. A page write is initiated the same as a byte write, but the microcontroller does not send a stop condition after the first data word is clocked in. Instead, after the EEPROM acknowledges receipt of the first data word, the microcontroller can transmit up to fifteen more data words. The EEPROM will respond with a zero after each data word received. The microcontroller must terminate the page write sequence with a stop condition (see Figure 11-3). The data word address lower four bits are internally incremented following the receipt of each data word. The higher data word address bits are not incremented, retaining the memory page row location. When the word address, internally generated, reaches the page boundary, the following byte is placed at the beginning of the same page. If more than sixteen data words are transmitted to the EEPROM, the data word address will “roll over” and previous data will be overwritten. The address “roll over” during write is from the last byte of the current page to the first byte of the same page. The device will acknowledge a write command, but not write the data, if the software write protection has been enabled. The write cycle time must be observed even when the write protection is enabled. 10 Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM ACKNOWLEDGE (ACK) POLLING: Once the internally-timed write cycle has started and the EEPROM inputs are disabled, ACK polling can be initiated. This involves sending a start condition followed by the device address word. The read/write bit is representative of the operation desired. Only if the internal write cycle has completed will the EEPROM respond with a zero allowing the read or write sequence to continue. 7. EEPROM Write Protection The device supports permanent and reversible software write protection and, once enabled, write protects the first-half of the array (00H - 7FH). PERMANENT SOFTWARE WRITE PROTECTION: The software write protection is enabled by sending a command similar to a normal write command; to the device which programs the permanent write protect register. The write protect register is programmed by sending a write command with the device address of ‘0110’ with the address and data bit being don’t cares (see Table 9-16 and Table 10-1). Once the software write protection has been enabled, the device will no longer acknowledge the ‘0110’ control byte. The software write protection cannot be reversed even if the device is powered down. The write cycle time must be observed. REVERSIBLE SOFTWARE WRITE PROTECTION: The reversible software write protection is enabled by sending a command, similar to a normal write command; to the device which programs the reversible write protect register. The write protect register is programmed by sending a write command ‘01100010’ with pins A2 and A1 tied to ground or no connect and pin A0 connected to VHV (see Figure 10-6 and Table 10-1). The reversible write protection can be reversed by sending a command ‘01100110’ with pin A2 tied to ground or no connect, pin A1 tied to VCC and pin A0 tied to VHV (see Figure 10-6 and Table 10-2). 8. Temperature Sensor Functional Description Atmel® AT30TSE002B consists of a Delta-Sigma Analog to Digital Converter (ADC) with a band gap type temperature sensor that monitors and updates its own temperature reading at least eight times per second converting the readings into digital data bits and latching them into a temperature register that can be read via 2wire I2C/SMBus serial interface. The device communicates over a 2-wire I2C/SMBus interface with the bus master or controller consisting of a serial clock (SCL) and serial bidirectional data bus (SDA) with clock frequencies up to 400Khz. The bus master or controller generates the SCL signal and is used by the AT30TSE002B to receive and send serial data on the SDA line with the most significant bit transferred first. A pull-up resistor is required on the SDA pin since it is in an open drain configuration. 8.1. EVENT Output The EVENT pin has three operating modes depending on configuration settings. They are Interrupt, Comparator, and Critical Alarm (Crit_Alarm) modes. In the Interrupt mode, once a temperature reaches a boundary limit, the AT30TSE002B asserts the EVENT pin. The EVENT pin will remain asserted until software clears the interrupt by writing a “1” to the EVTCLR bit five in the configuration register. When the temperature drops below specified limits, the device returns back to either interrupt or comparator mode as programmed in the configuration register’s EVTMOD bit zero. In the comparator mode, the EVENT pin remains asserted until the error condition that caused the pin to be asserted no longer exists and the EVENT pin will clear itself. In the Crit_Alarm mode, when the measured temperature exceeds Crit_Alarm trip limit, the EVENT pin will remain asserted until the temperature drops below Crit_Alarm limit minus hysteresis (See Figure 9-1). All event thresholds use hysteresis as programmed in the configuration register. 11 8711D–SEEPR–8/10 8.2. Alarm Window The alarm window consists of the Upper Alarm Trip Register and Lower Alarm Trip Register. The Upper Alarm Trip Register holds the upper temperature trip point and the Lower Alarm Trip Register holds the lower temperature trip point. After the EVENT pin control is enabled, the EVENT output will be triggered upon entering and exiting from this window. 8.3. Temperature Sensor Power-on Default The Atmel® AT30TSE002B has an internal Power-on Reset (POR) circuit. When the supply voltage drops below the POR threshold, the device will reset to the following power-on default conditions: • Sensor starts monitoring temperature continuously • Address Pointer Register = 00h • Upper / Lower Alarm Trip registers and Crit_Alarm registers are set to 0°C • EVENT register cleared and pulled high by external pull up resistor • Operational mode is Comparator • EVENT hysteresis is 0°C • SMBus register =00h 8.4. Device Initialization The AT30TSE002B Temperature Sensor has programmable registers that, upon device power-on, are initialized to ‘0’. Table 9-1 shows the power-on register default values. The EVENT output is defaulted to deasserted state and comparator mode. Please note the Upper Alarm Trip, Lower Alarm Trip, Critical Alarm Trip registers and Configuration registers need to be programmed to desired values before temperature sensor can properly function. 8.5. SMBus Timeout The AT30TSE002B supports the SMBus timeout feature for temperature sensor operations if enabled via setting the SMBus register (see Section 9.10). This feature helps prevent potential system bus hang-ups by resetting the serial interface if SCL stays low for a time specified by the tOUT parameter. This requires a minimum SCL clock speed of 10Khz as specified in the SMBus specification to avoid any timeout issues. 12 Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM 9. Register Descriptions This section describes all the temperature sensor registers that are used in Atmel® AT30TSE002B. The AT30TSE002B has several registers that are user accessible and or programmable and used for latching temperature readings, storing high and low temperature limits, configuring the hysteresis threshold and reporting status. These registers include the Capability Register, Upper Alarm Trip Register, Lower Alarm Trip Register, Critical Alarm Trip Register, Temperature Register, Manufacturer Identification Register, Device Identification Register and SMBus Register. The AT30TSE002B uses an 8-bit Pointer Register to access these registers and all other registers contain 16-bits. The below, Table 9-1, indicates the Write / Read access capability of each register. Reading from a write only register will result in reading ‘0’ data and writing to read only register will have no impact even though the write sequence was acknowledged by the device. Table 9-1. Register Summary Registers Address (hex) Read / Write Register Name Section Power up Default Register data (hex) n/a W Address Pointer 9.1 00h 00h R Capability 9.2 00D7h 01h R/W Configuration 9.3 0000h 02h R/W Upper Alarm Trip 9.4 0000h 03h R/W Lower Alarm Trip 9.5 0000h 04h R/W Critical Alarm Trip 9.6 0000h 05h R Temperature Data 9.7 n/a 06h R Manufacturer I.D. 9.8 001Fh 07h R Device I.D. / Device Revision 9.9 8201h 08h to 21h R/W Reserved (1) n/a 0000h 22h R/W SMBus Timeout 9.10 0000h 23h to FFh R/W Reserved (1) n/a 0000h Note: 9.1. 1. Write operations to reserve registers should be avoided as it may cause undesirable results Address Pointer Register The AT30TSE002B uses a Pointer Register to select and access the 16-bit data registers shown in Table 9-1. The Pointer Register is an 8-bit write only register (See Table 9-2). The power on default value is 00h which is the address location for the capability register. Table 9-2. Address Pointer Register Bit 7 6 5 Symbol 4 3 2 1 0 Pointer Bits R/W W W W W W W W W Default Value 0 0 0 0 0 0 0 0 13 8711D–SEEPR–8/10 9.2. Capability Register (16-bit Read only, Address = 00h) The Atmel® AT30TSE002B is capable of measuring temperature with ±1°C over the active range and ±2°C over the monitor range. This register is a 16-bit read-only register used to specify the capabilities of the temperature sensor. The Capability Register functions are described in Table 9-3 and Table 9-4. Table 9-3. Capability Register Bit Distribution Bit 15 14 13 12 Symbol 11 10 9 8 RFU Default Value 0 0 0 0 0 0 0 0 R / W access R R R R R R R R Bit 7 6 5 4 3 2 1 0 EVSD TMOUT VHV RANGE SACC ICAP Default Value 1 1 1 1 0 1 1 1 R / W access R R R R R R R R Symbol Table 9-4. TPRES Capability Register Bit Description Bit Symbol Description 15:8 RFU Reserved for Future Use and must be '0' 7 EVSD Event Output Status During Shutdown Mode 1 = The EVENT pin output is deasserted (not driven) when entering shutdown mode and will resume status update immediately upon exiting shutdown. In addition, the EVTSTS bit in the configuration register will be cleared when entering shutdown mode and will resume status update immediately upon exiting shutdown. 6 TMOUT Bus Timeout 1 = Supported within the SMBus compatible range 25 to 35mS (power-up default) 5 VHV High Voltage Support for A0 pin 1 = A0 Pin supports a voltage up to 10 volts (power up default) 4:3 TPRES Temperature resolution '10' – supports 0.125°C 14 2 RANGE '1' – Can read temperatures below 0°C and sets appropriate sign bit 1 SACC Supported Accuracy. '1' – Supports B grade accuracy of ± 1°C over the active range (75°C to 95°C) and 2°C over the monitor range (40°C to 125°C ) 0 ICAP Interrupt Capability. '1' – has alarm and critical trip interrupt capability Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM 9.3. Configuration Register (16-bit Read/Write, Address = 01h) The Atmel® AT30TSE002B contains a 16-bit Configuration Register allowing the user to set key operational features of the Temperature Sensor. The Configuration Register functions are described in Table 9-5 and Table 9-6. Table 9-5. Configuration Register Bit Distribution Bit 15 14 Symbol 13 12 11 10 RFU 9 HYSTENB 8 SHTDWN Default Value 0 0 0 0 0 0 0 0 R / W access R R R R R R/W R/W R/W Bit 7 6 5 4 3 2 1 0 EVTCLR EVTSTS EVTOUT CRITEVT EVTPOL EVTMOD Symbol CRTALML WINLOCK Default Value 0 0 0 0 0 0 0 0 R / W access R/W R/W W R R/W R/W R/W R/W Table 9-6. Bit Configuration Register Bit Description Symbol Description 15:11 RFU Reserved for Future Use and must be '0'. 10:9 HYSTENB Hysteresis Enable ’00’ = 0°C Disable hysteresis (default power-on condition) '01' = 1.5°C Enable hysteresis ‘10’ = 3.0°C Enable hysteresis ‘11’ = 6.0°C Enable hysteresis The purpose of these bits is to control the hysteresis applied to the alarm trip point boundaries. The above hysteresis applies to all limits when temperature drops below the user specified alarm trip points. Please note that hysteresis applies to decreasing temperature only. Once ambient temperature is above a given threshold, it must drop below the boundary limit minus hysteresis in order for a comparator EVENT to be cleared. For example, if these bits are set to ‘01’ for 1.5°C and the Upper Alarm Trip limit is set to 85°C, as temperature rises above 85°C, bit 14 of temperature register will be set to a ‘1’. Bit 14 will remain set until the ambient temperature drops below the threshold (85°C) minus the hysteresis value or 83.5°C. Note that hysteresis is also applied to the EVENT pin functionality. When either of the Crit_Alarm Trip or Alarm Window lock bits is set, this bit cannot be altered until unlocked. 8 SHTDWN Shutdown Mode 0 = Temperature sensor enabled for continuous conversion (power-on default) 1 = Temperature sensor disabled In Shutdown mode, the temperature sensor is not active and will not generate interrupts or update temperature data. The EVENT pin is deasserted (not driven) When either of the Crit_Alarm Trip or Alarm Window lock bits is set, this bit cannot be altered until unlocked 15 8711D–SEEPR–8/10 Bit 7 Symbol CRTALML Description Crit_Alarm Trip Lock bit Locks the Critical Alarm Trip register from being updated 0 = Crit_Alarm Trip register can be updated (Power-on default) 1 = Crit_Alarm Trip register is locked and cannot be updated Once set, it can be only be cleared to ‘0’ by internal power on reset (POR) which occurs when the device is powered off and then powered on 6 WINLOCK Alarm Window Lock bit 0 = Upper and Lower Alarm Trip Registers can be updated (Power-on default) 1 = Upper and Lower Alarm Trip Registers are locked and cannot be updated Once set, it can be only be cleared to ‘0’ by internal power on reset (POR) when device is powered off then powered on 5 EVTCLR EVENT Clear. This bit is a Write only bit and will read ‘0’ This bit can clear the EVENT pin after it has been enabled and is self clearing 0 = has no effect (power-on default) 1 = clears (releases) the active EVENT pin in interrupt mode. This bit is ignored when in comparator mode 4 EVTSTS EVENT Pin Output Status 0 = The EVENT Output is not asserted by the device. (Power-on default) 1 = The EVENT Output is asserted due to an alarm trip condition Please note this bit will be cleared when entering shutdown mode and will resume status update immediately upon exiting shutdown 3 EVTOUT EVENT Output Control This bit, when set, prevents the EVENT pin from generating an interrupt 0 = The EVENT output is disabled and will not generate interrupts (Power-on default) 1 = The EVENT output is enabled When either of the Crit_Alarm Trip or Alarm Window lock bits is set, this bit cannot be altered until unlocked 2 CRITEVT Critical Temperature only 0 = The EVENT output is asserted for the Upper, Lower and Critical Alarms (Power-on default) 1 = The EVENT output is asserted for only Critical Alarm when ambient temperature > Crit_Alarm trip boundary When the Alarm Window lock bit is set, this bit cannot be altered until unlocked 1 EVTPOL EVENT Polarity 0 = Active LOW. (Power-on default) A pull-up resistor is required on this pin to set inactive state 1 = Active HIGH When either of the Crit_Alarm Trip or Alarm Window lock bits is set, this bit cannot be altered until unlocked 0 EVTMOD EVENT Mode 0 = The EVENT pin will operate in Comparator mode. (Power-on default) 1 = The EVENT pin will operate in Interrupt mode When either of the Crit_Alarm Trip or Alarm Window lock bits is set, this bit cannot be altered until unlocked 16 Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM EVENT Pin Mode Functionality Figure 9-1. Crit_Alarm Upper Ala rm Measured Temperature Lower Alarm Switches to Compa rator Mode Software Resets Inter rupt EVENT pin in “Interrupt Mode” (active low) EVENT pin in “Compa rator Mode” (active low) 9.4. Upper Alarm Trip Register (16-bit Read/Write, Address = 02h) The Upper Alarm Trip Register holds the user programmed upper temperature boundary trip point in 11-bit two’s complement format (0.25°C resolution) that can be used to monitor ambient temperature in an operating window (See Table 9-7 and Table 9-8). When the temperature increases above this trip point, or drops below or is equal to the trip point (minus any hysteresis set), then the EVENT pin is asserted (if enabled). This register becomes read only if the Alarm Window Lock bit (WINLOCK) bit six in the configuration register is set to a ‘1’. Table 9-7. Upper Alarm Trip Register Bit Distribution Bit 15 Symbol 14 13 RFU 12 11 10 SIGN 9 8 ALMWINH Default Value 0 0 0 0 0 0 0 0 R / W access R R R R/W R/W R/W R/W R/W Bit 7 6 5 4 3 2 1 0 Symbol ALMWINH RFU Default Value 0 0 0 0 0 0 0 0 R / W access R/W R/W R/W R/W R/W R/W R R 17 8711D–SEEPR–8/10 Table 9-8. Upper Alarm Trip Register Bit Description Bit Symbol Description 15:13 RFU Reserved for future use. Read as ‘0’ 12 SIGN Sign bit 0 = Ambient temperature is greater than or equal to 0°C 1= Ambient temperature is less than 0°C 11:2 ALMWINH Upper Alarm Trip temperature bits Represented in two’s complement format 0:1 9.5. RFU Reserved for future use. Read as ‘0’ Lower Alarm Trip Register (16-bit Read/Write, Address = 03h) The Lower Alarm Trip Register holds the user programmed lower temperature boundary trip point in 11-bit two’s complement format (0.25°C resolution) that can be used to monitor ambient temperature in an operating window (See Table 9-9 and Table 9-10). When temperature decreases below this trip point minus any hysteresis set or increases to meet or exceed this trip point, then the EVENT pin is asserted (if enabled). This register becomes read only if the Alarm Window Lock bit (WINLOCK) bit six in the Configuration register is set to a ‘1’. Table 9-9. Lower Alarm Trip Register Bit Distribution Bit 15 Symbol 14 13 RFU 12 11 10 SIGN 9 8 ALMWINL Default Value 0 0 0 0 0 0 0 0 R / W access R R R R/W R/W R/W R/W R/W Bit 7 6 5 4 3 2 1 0 Symbol ALMWINL RFU Default Value 0 0 0 0 0 0 0 0 R / W access R/W R/W R/W R/W R/W R/W R R Table 9-10. Lower Alarm Trip Register Bit Description Bit Symbol Description 15:13 RFU Reserved for future use. Read as ‘0’ 12 SIGN Sign bit 0 = Ambient temperature is greater than or equal to 0°C 1= Ambient temperature is less than 0°C 11:2 ALMWINL Lower Alarm Trip temperature bits Represented in two’s complement format 0:1 18 RFU Reserved for future use. Read as ‘0’ Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM 9.6. Critical Alarm Trip Register (16-bit Read/Write, Address = 04h) The Critical Alarm Trip Register holds the user programmed Critical Alarm temperature boundary trip point in 11-bit two’s complement format (0.25°C resolution) that can be used to monitor ambient temperature (See Table 9-11 and Table 9-12). When the temperature increases above this trip point, the EVENT pin will be asserted (if enabled). It will remain asserted until temperature decreases below or equal to the trip point minus any hysteresis set. This register becomes read only if the Critical Alarm Trip Lock Bit (CRTALML) bit seven in the configuration register is set to a ‘1’. Table 9-11. Critical Alarm Trip Register Bit Distribution Bit 15 Symbol 14 13 12 RFU 11 10 SIGN 9 8 CRITEVT Default Value 0 0 0 0 0 0 0 0 R / W access R R R R/W R/W R/W R/W R/W Bit 7 6 5 4 3 2 1 0 Symbol CRITEVT RFU Default Value 0 0 0 0 0 0 0 0 R / W access R/W R/W R/W R/W R/W R/W R R Table 9-12. Critical Alarm Trip Register Bit Description Bit Symbol Description 15:13 RFU Reserved for future use. Read as ‘0’ 12 SIGN Sign bit 0 = Ambient temperature is greater than or equal to 0°C 1= Ambient temperature is less than 0°C 11:2 CRITEVT Critical Alarm Trip temperature bits Represented in two’s complement format 0:1 RFU Reserved for future use. Read as ‘0’ 19 8711D–SEEPR–8/10 9.7. Temperature Register (16-bit Read only, Address = 05h) The Temperature Register holds the internal temperature measurement data represented in 11-bit 2’s complement word format allowing for resolution equal to 0.125°C (least significant bit). The upper three bits (15, 14, 13) of the temperature register indicates the trip status of the current temperature and most important, are not affected by the status of the output of the EVENT pin (See Table 9-13 and Table 9-14). Table 9-13. Temperature Register Bit Distribution Bit 15 Symbol 14 CRITHIGH ALMHIGH 13 12 11 10 9 8 ALMLOW SIGN 128°C 64°C 32°C 16°C Default Value 0 0 0 0 0 0 0 0 R / W access R R R R R R R R Bit 7 6 5 4 3 2 1 0 8°C 4°C 2°C 1°C 0.5°C 0.25°C 0.125°C RFU Default Value 0 0 0 0 0 0 0 0 R / W access R R R R R R R R Symbol Table 9-14. Temperature Register Bit Description Bit Symbol Description 15 CRITHIGH 0 = Ambient temperature is less than the Critical Alarm Trip Register setting 1 = Ambient temperature is greater than or equal to Critical Alarm Trip Register setting When this bit is set ‘1’, it will automatically clear once the measured temperature decreases below or is equal to the trip point minus any hysteresis set 14 ALMHIGH 0 = Ambient temperature is below the Upper Alarm Trip register setting 1 = Ambient temperature is above the Upper Alarm Trip register setting When the bit is set ‘1’, it will automatically clear once the measured temperature decreases below or is equal to the trip point minus any hysteresis set 13 ALMLOW 0 = Ambient temperature is above the Lower Alarm Trip register setting 1 = Ambient temperature is below the Lower Alarm Trip register setting When the bit is set ‘1’, it will automatically clear once the measured temperature increases above or is to equal to the trip point 12 SIGN Sign Bit 0 = Ambient temperature is greater than or equal to 0°C 1 = Ambient temperature is less than 0°C 11:1 TEMP Ambient Temperature Bits Represented in two’s complement format The encoding of bits B11 through B2 is the same as in the Alarm Trip registers 0 20 RFU Reserved for future use. Read as ‘0’ Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM 9.7.1. Temperature Register Format This section will clarify the temperature register format and temperature bit value assignments used for temperature for the following registers: Upper Alarm Trip, Lower Alarm Trip, Critical Alarm Trip and Temperature Data. The temperatures expressed in the Upper Alarm Trip, Lower Alarm Trip, Critical Alarm Trip and Temperature Data Registers are indicated in two’s complement format. In each of the trip registers, bits 12 through bit two are used for temperature settings, or in the case of the temperature register, holds the internal temperature measurement with bits 12 through bit one allowing 0.125ºC resolution. Table 9-15indicates the temperature register’s assigned bit values used for temperature. Table 9-16 below shows examples for temperature register bit values for various temperature readings. Table 9-15. Temperature Register Format Bit Position Bit Value 12 11 10 9 8 7 6 5 4 SIGN 128°C 64°C 32°C 16°C 8°C 4°C 2°C 1°C 3 2 1 0.5°C 0.25°C 0.125°C 0 X Table 9-16. Temperature Register Examples Temperature Register Value Examples Temperature Binary (Bit15 – Bit0) +125°C xxx0 0111 1101 00xx +99.75°C xxx0 0110 0011 11xx +85°C xxx0 0101 0101 00xx +39°C xxx0 0010 0111 00xx +15.75°C xxx0 0000 1111 11xx +0.25°C xxx0 0000 0000 01xx 0°C xxx0 0000 0000 00xx -0.25°C xxx1 1111 1111 11xx -1°C xxx1 1111 1110 00xx -20°C xxx1 1110 1100 00xx 21 8711D–SEEPR–8/10 9.8. Manufacturer ID Register (16-bit Read only, Address = 06h) This register is used to identity the manufacturer of the product. The manufacturer ID for the Atmel® AT30TSE002B is 001Fh (See Table 9-17). Table 9-17. Manufacturer ID Register Bit Distribution Bit 15 14 13 Symbol 11 10 9 8 Manufacturer ID Default Value 0 0 0 0 0 0 0 0 R / W access R R R R R R R R Bit 7 6 5 4 3 2 1 0 Symbol 9.9. 12 Manufacturer ID Default Value 0 0 0 1 1 1 1 1 R / W access R R R R R R R R Device ID Register (16-bit Read only, Address = 07h) The upper or high order byte is used to specify the device identification and the other byte is used to specify device revision. The device ID for the AT30TSE002B is 8201h (See Table 9-18). Table 9-18. Device ID Register Bit Distribution Bit 15 14 13 12 Symbol 10 9 8 Device ID Default Value 1 0 0 0 0 0 1 0 R / W access R R R R R R R R Bit 7 6 5 4 3 2 1 0 Symbol 22 11 Device Revision Default Value 0 0 0 0 0 0 0 1 R / W access R R R R R R R R Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM 9.10. SMBus Register (16-bit Write / Read only, Address = 22h) The SMBus Register allows the user to enable or disable the SMBus time out feature (See Table 9-19 and Table 9-20). Table 9-19. SMBus Register Bit Distribution Bit 15 14 13 12 Symbol 11 10 9 8 RFU Default Value 0 0 0 0 0 0 0 0 R / W access R R R R R R R R Bit 7 6 5 4 3 2 1 0 Symbol SMBOUT RFU Default Value 0 0 0 0 0 0 0 0 R / W access R/W R R R R R R R Table 9-20. SMBus Register Bit Distribution Bit Symbol Description 15:8 RFU Reserved for future use. Read as ‘0’ 7 SMBOUT SMBus Timeout 0 = SMBus timeout is enabled 1 = SMBus timeout is disabled When enabled, timeout is active for temperature sensor operations When either of the Crit_Alarm Trip or Alarm Window lock bits is set, this bit cannot be altered until unlocked 6:0 RFU Reserved for future use. Read as ‘0’ 23 8711D–SEEPR–8/10 10. TS Write Operations Writing to the Atmel® AT30TSE002B Temperature register set is accomplished through a modified write operation for two data bytes. To maintain two-wire compatibility, the 16-bit register is accessed through a pointer register, requiring the write sequence to include an address pointer in addition to the device address. This indicates the storage location for the next two bytes received. Figure 10-2 shows an entire write transaction on the bus. Figure 10-1. S T A R T TS Register Write Operation W R I T E DEVICE ADDRESS 0 0 1 REGISTER POINTER DATA MSB S T O P DATA LSB 1 A2 A1 A0 R A / C W K A C K A C K A C K 10.1. TS Read Operations Reading data from the TS may be accomplished in one of two ways: a) If the location latched in the pointer register is correct (for normal operation it is expected the same address will be read repeatedly for temperature), the read sequence may consist of a device address from the bus master followed by two bytes of data from the device; or b) The pointer register is loaded with the correct register address, and the data is read. The sequence to preset the pointer register is shown in Figure 10-2 and the preset pointer read is shown in Figure 10-3. If it is desired to read random address each cycle, the complete Pointer Write, Word Read sequence is shown in Figure 10-4. The data byte has the most significant bit first. At the end of a read, this device can accept either Acknowledge (Ack) or No Acknowledge (No Ack) from the Master (No Acknowledge is typically used as a signal for the slave that the Master has read its last byte). Figure 10-2. S T A R T Write to Pointer Register W R I T E DEVICE ADDRESS 0 0 1 1 A2 A1 A0 R / W Figure 10-3. S T A R T 0 1 1 R E A D A C K DATA MSB A C K S T O P DATA LSB A2 A1 A0 R A / C W K 24 A C K Preset Pointer Register Word Read DEVICE ADDRESS 0 S T O P REGISTER POINTER N O A C K Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM Figure 10-4. S T A R T DEVICE ADDRESS Two-Wire Pointer Write Register Word Read W R I T E S T A R T REGISTER POINTER 0 0 1 1 A2 A1 A0 DATA MSB A C K S T O P DATA LSB N O A C K R A / C WK A C K Setting Permanent Write Protect Register (PSWP) S T A R T SDA LINE R E A D 0 0 1 1 A2 A1 A0 R A / C WK Figure 10-5. DEVICE ADDRESS CONTROL BYTE WORD ADDRESS S T O P DATA 0 1 1 0 A2 A1 A0 0 A C K A C K A C K = Don't Care Figure 10-6. Setting Reversible Write Protect Register (RSWP) S T A R T SDA LINE CONTROL BYTE WORD ADDRESS S T O P DATA 0 1 1 0 0 0 1 0 A C K A C K A C K = Don't Care Figure 10-7. Clearing Reversible Write Protect Register (RSWP) S T A R T SDA LINE CONTROL BYTE WORD ADDRESS S T O P DATA 0 1 1 0 0 1 1 0 A C K A C K A C K = Don't Care 25 8711D–SEEPR–8/10 Table 10-1. EEPROM Write Protection Pin Preamble RW Command A2 A1 A0 B7 B6 B5 B4 B3 B2 B1 B0 Set PSWP A2 A1 A0 0 1 1 0 A2 A1 A0 0 Set RSWP 0 0 VHV 0 1 1 0 0 0 1 0 Clear RSWP 0 1 VHV 0 1 1 0 0 1 1 0 Min Max Units 7 10 V Table 10-2. VHV VHV Table 10-3. EEPROM Software Write Protection Command Permanent Reversible Write Protect Write Protect Acknowledgement Register PSWP Register RSWP from Device Action from Device 1010 R X X ACK 1010 W Programmed X ACK Can write to second Half (80H - FFH) only 1010 W X Programmed ACK Can write to second Half (80H - FFH) only W Not Programmed Not Programmed ACK Can write to full array R Programmed X No ACK 1010 Read PSWP Read PSWP Set PSWP Set PSWP Read RSWP Read RSWP Set RSWP Set RSWP Clear RSWP Clear RSWP 26 R/W Bit STOP - Indicates permanent write protect register is programmed R W Not Programmed X Programmed X ACK Read out data don't care. Indicates PSWP register is not programmed No ACK STOP - Indicates permanent write protect register is programmed Not Programmed X R X Programmed No ACK R X Not Programmed ACK W X Programmed No ACK STOP - Indicates reversible write protect register is programmed W X Not Programmed ACK Program reversible write protect register W ACK Program permanent write protect register (irreversible) STOP - Indicates reversible write protect register is programmed Read out data don't care. Indicates RSWP register is not programmed (reversible) W Programmed X No ACK STOP - Indicates permanent write protect register is programmed W Not Programmed X ACK Clear (unprogram) reversible write protect register (reversible) Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM 11. EEPROM Read Operations Read operations are initiated the same way as write operations with the exception that the read/write select bit in the device address word is set to one. There are three read operations: current address read, random address read and sequential read. CURRENT ADDRESS READ: The internal data word address counter maintains the last address accessed during the last read or write operation, incremented by one. This address stays valid between operations as long as the chip power is maintained. The address “roll over” during read is from the last byte of the last memory page to the first byte of the first page. Once the device address with the read/write select bit set to one is clocked in and acknowledged by the EEPROM, the current address data word is serially clocked out. To end the command, the microcontroller does not respond with an input zero but does generate a following stop condition (see Figure 11-4). RANDOM READ: A random read requires a “dummy” byte write sequence to load in the data word address. Once the device address word and data word address are clocked in and acknowledged by the EEPROM, the microcontroller must generate another start condition. The microcontroller now initiates a current address read by sending a device address with the read/write select bit high. The EEPROM acknowledges the device address and serially clocks out the data word. To end the command, the microcontroller does not respond with a zero but does generate a following stop condition (see Figure 11-5). SEQUENTIAL READ: Sequential reads are initiated by either a current address read or a random address read. After the microcontroller receives a data word, it responds with an ACK. As long as the EEPROM receives an ACK, it will continue to increment the data word address and serially clock out sequential data words. When the memory address limit is reached, the data word address will “roll over” and the sequential read will continue. The sequential read operation is terminated when the microcontroller does not respond with a zero but does generate a following stop condition (see Figure 11-6). PERMANENT WRITE PROTECT REGISTER (PSWP) STATUS: To find out if the register has been programmed, the same procedure is used as to program the register except that the R/W bit is set to one. If the device sends an acknowledge, then the permanent write protect register has not been programmed. Otherwise, it has been programmed and the device is permanently write protected at the first half of the array. Table 11-1. PSWP Status Pin Preamble RW Command Read PSWP A2 A1 A0 B7 B6 B5 B4 B3 B2 B1 B0 A2 A1 A0 0 1 1 0 A2 A1 A0 1 REVERSIBLE WRITE PROTECT REGISTER (RSWP) STATUS: To find out if the register has been programmed, the same procedure is used as to program the register except that the R/W bit is set to one. If the device sends an acknowledge, then the reversible write protect register has not been programmed. Otherwise, it has been programmed and the device is write protected (reversible) at the first half of the array. Figure 11-1. 1 MSB 0 EEPROM Device Address 1 0 A2 A1 A0 R/W LSB 27 8711D–SEEPR–8/10 28 Figure 11-2. EEPROM Byte Write Figure 11-3. EEPROM Page Write Figure 11-4. EEPROM Current Address Read Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM Figure 11-5. EEPROM Random Read Figure 11-6. EEPROM Sequential Read 29 8711D–SEEPR–8/10 12. Ordering Information 12.1. Ordering Code Detail AT 3 0 T S E 0 0 2 B - M A H - T Atmel Designator Shipping Carrier Option B = Bulk (tubes) T = Tape and reel Product Family Device Grade H = Green, NiPdAu lead finish Temperature range -20°C to +125°C Memory Type E = EEPROM Package Option Sensor Type MA = 8-pad, 2 x 3 x 0.8mm (WDFN) Device Density 2 = 2-kilobit Device Revision 12.2. Green Package Options (Pb/Halide-free/RoHS Compliant) Ordering Code AT30TSE002B-MAH-T Note: Package Lead Finish 8M2 NiPdAu Operating Voltage Max. Freq. (KHz) Operational range 2.7V to 3.6V 400 –20°C to 125°C 1. The shipping carrier option code is not marked on the devices Package Type 8M2 30 8-pad, 2 x 3 x 0.8mm, Thermally Enhanced Plastic Very Very Thin Dual Flat No Lead Package (WDFN) Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM WDFN Marking TOP MARK |---|---|---| T 2 B |---|---|---| H @ |---|---|---| Y X X |---|---|---| * | Pin 1 Indicator (Dot) Y = YEAR OF ASSEMBLY XX = ATMEL LOT NUMBER TO COORESPOND WITH TRACE CODE LOG BOOK. (e.g. XX = AA, AB, AC,...AX, AY, AZ) Y = 8: 9: 0: 1: SEAL YEAR 2008 2: 2012 2009 3: 2013 2010 4: 2014 2011 5: 2015 31 8711D–SEEPR–8/10 13. Package Drawings 8M2 – WDFN COMMON DIMENSIONS (Unit of Measure – mm) SYMBOL MIN D D2 1.35 1.40 1.45 E2 1.25 1.30 1.35 A 0.70 0.75 0.80 A1 0.0 0.02 0.05 L 0.35 0.40 0.45 0.50 BSC e b NOTE 0.20 REF A3 0.18 0.25 0.30 2 1. This drawing is for general information only. Refer to JEDEC Drawing MO-229, WCED-3, for proper dimensions, tolerances, datums, etc 2. Dimensions b applies to metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. If the terminal has the optional radius on the other end of the terminal, the dimensions should not be measured in that radius area 3. Soldering the large thermal pad is optional, but not recommended. No electrical connection is accomplished to the device through this pad, so if soldered it should be tied to ground 6/12/09 Package Drawing Contact [email protected] 32 MAX 3.00 BSC E Notes NOM 2.00 BSC TITLE 8M2, 8-lead 2.0x3.0mm Body, 0.50mm Pitch, WDFN, Very Very Thin, Dual No Lead Package (Sawn) GPC DRAWING NO. REV. YDL 8M2 A Atmel AT30TSE002B [Preliminary] 8711D−SEEPR−8/10 Temperature Sensor with Serial EEPROM 14. Revision History Doc. Rev. Date 8711D 08/2010 Comments R to R / W for 22h in Register Summary table Correct cross references in EEPROM Write Operations 8711C 07/2010 Section 12.2, change part number to -MAH-T from -MA-T 8711B 05/2010 Add statement in Section 2 before Serial Clock definition 8711A 04/2010 Initial document release 33 8711D–SEEPR–8/10 He ad q ua rt e rs In t er n at io n al Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: (+1) (408) 441-0311 Fax: (+1) (408) 487-2600 www.atmel.com Atmel Asia Limited Unit 01-5 & 16, 19F BEA Tower, Millennium City 5 418 Kwun Tong Road Kwun Tong, Kowloon HONG KONG Tel: (+852) 2245-6100 Fax: (+852) 2722-1369 Atmel Munich GmbH Business Campus Parkring 4 D-85748 Garching b. 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Atmel®, Atmel logo and combinations thereof, and others are registered trademarks, CryptoAuthentication™ and others, are trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others. 8711D–SEEPR–8/10