SMH-01B01 PythPits series Infrared Array Sensor Module OVERVIEW The PythPits-series SMH-01B01 is a thermopile-type infrared array sensor module that features an 8×8 array of sensor elements to detect and convert the infrared energy within an area to a signal for output. It is equipped with a Si-lens optical system, and features an MCU with built-in A/D converter that generates digital output, on an I 2 C interface, of both the converted emission temperature of each sensor element and the ambient temperature from a temperature sensor mounted on the sensor chip. FEATURES ▪ 8×8 structure, 64-element array ▪ Si lens optical system, approximately 35° total field-of-view angle (between peak value of elements on both sides) ▪ Gain switching for measurement extension up to 250°C using variable-gain preamplifier (25°C ambient temperature environment) ▪ Built-in auto range function automatically adjusts the gain to match the temperature within the area ▪ Switchable frame measurement speed: 4, 2, 1 fps ▪ Switchable voltage output and emission temperature conversion output ▪ Changeable data readout order: top/bottom reversal and left/right reversal to support horizontal/vertical rotation ▪ SMBUS standard PEC code support ▪ Emission temperature resolution: ±1.5°C ▪ Supply voltage: 5V ± 5% ▪ Current consumption: 7 mA (typ.) BLOCK DIAGRAM (Infrared Input) SDA Si-Lens Sensor Control 8x8 Thermopile Array Sensor SCL MCU with A/D-C VDD AMP VSS Sensor Outputs(Ta,IR) Figure 1 Block diagram PIN LAYOUT 4pin SDA 3pin SCL 2pin VDD 1pin VSS CN1 CN1: S4B-ZR-SM4A Top view Figure 2 Pin layout diagram SEIKO NPC CORPORATION - 1 SMH-01B01 PIN DESCRIPTION Pin No. Name I/O Description 1 VSS ‐ Ground pin 2 VDD ‐ Supply pin 3 SCL I I 2 C interface clock input pin 4 SDA I/O I 2 C interface data input/output pin ABSOLUTE MAXIMUM RATINGS Parameter Symbol Condition Rating Unit Notes Supply voltage range VDD Between VDD - VSS -0.3 to 6.0 V *1 Input voltage range VIN Between input - VSS -0.3 to VDD+0.3 V *1,*2 Output voltage range VIN Between output - VSS -0.3 to VDD+0.3 V *1,*2 Maximum sink current ISNK Output pin = Low 10 mA Storage temperature TSTG -40 to 100 °C *1. Absolute maximum ratings are values not to be exceeded, not even momentarily. If a rating is exceeded, there is a risk of deterioration in characteristics and decrease in reliability. *2. VDD value is the operating voltage rating of the VDD pin in the recommended operating conditions. RECOMMENDED OPERATING CONDITIONS Parameter Supply voltage Operating temperature Symbol Condition VDD *1 Ta No condensation MIN TYP MAX Unit 4.75 5.00 5.25 V -20 - 70 °C *1. Operation is supported at the storage temperature, but emission temperature correction cannot be confirmed if these ratings are exceeded. ELECTRICAL CHARACTERISTICS DC Characteristics (Reference circuit under recommended operating conditions, unless otherwise noted) Parameter Symbol Condition MIN TYP MAX Unit - 7.0 10.0 mA Current consumption IDD VDD = 5.25V High-level input voltage VIH SDA, SCL 0.7VDD - VDD V Low-level input voltage VIL SDA, SCL 0 - 0.3VDD V High-level input leakage current ILH SDA, SCL (VIN=VDD) - - 1.0 µA Low-level input leakage current ILL SDA, SCL (VIN=0V) - - 1.0 µA Low-level output voltage VOL SDA=Low output, 5mA 0 - 0.6 V SEIKO NPC CORPORATION - 2 SMH-01B01 AC Characteristics Start/Stop Condition Bit Timing tHD:STA tSU:STA tHD:STO tSU:STO SCL SDA S(Start Condition) P(Stop Condition) Figure 3 Start/Stop conditions bit timing (Reference circuit under recommended operating conditions, unless otherwise noted) Parameter Symbol Condition MIN TYP MAX Unit Start condition setup time tSU:STA SCL, SDA pins 600 - - ns Start condition hold time tHD:STA SCL, SDA pins 600 - - ns Stop condition setup time tSU:STO SCL, SDA pins 600 - - ns Stop condition hold time tHD:STO SCL, SDA pins 600 - - ns Bus Data Timing 1/fSCL (S) tHIGH tLOW tr (S) tf (P) SCL tBUF tHD:DAT tSU:DAT SDA(IN) tr tVD:DAT tf SDA(OUT) Figure 4 Bus data timing (Reference circuit under recommended operating conditions, unless otherwise noted) Parameter Symbol Conditions MIN TYP MAX Unit SCL clock frequency fSCL - - 400 kHz SCL clock low-level cycle time tLOW 1300 - - ns SCL clock high-level cycle time tHIGH 600 - - ns SCL, SDA rise time 1 tr fCLS > 100kHz 20+0.1×CB - 300 ns SCL, SDA rise time 2 tr fCLS ≤ 100kHz - - 1000 ns SCL, SDA fall time tf 20+0.1×CB - 300 ns SCL, SDA data setup time 1 tSU:DAT fCLS > 100kHz 100 - - ns SCL, SDA data setup time 2 tSU:DAT fCLS ≤ 100kHz 250 - - ns SCL, SDA data hold time tHD:DAT Data input 0 - 900 ns SCL, SDA data valid time tVD:DAT Data output - - 900 ns SCL, SDA bus capacitance CB - - 400 pF SEIKO NPC CORPORATION - 3 SMH-01B01 FUNCTIONAL DESCRIPTION I 2 C Interface Writing and reading configuration data is performed using an I 2 C interface. The device has a unique 7-bit address (slave address), and specifying the address is required. Configuration data is in MSB-first, 8-bit format. Start/Stop Conditions SDA SCL START STOP Figure 5 Start/Stop Conditions The Start condition occurs when SCL is “High” and SDA goes “High” → “Low”. Next, data is sent and received by the level transitions on SDA while SCL is “Low”. The Stop condition occurs when SCL is “High” and SDA goes “Low” → “High”, and the basic communication cycle ends. To change slave address or read/write mode during communication, you can set SDA from “High” → “Low” when SCL is “High” (Start condition) to restart the cycle in the same way. Basic Cycle [Command write cycle] The basic write cycle starts with the Start condition, followed by the 7-bit address and write (W) bit. Then a command is sent and data is written to the device. S 1st Byte Address+W A Command A DATA0-Low A DATA0-High ・・・・・・・・・ A DATAn-Low A DATAn-High A (PEC) A A/ P NA Figure 6 Command write cycle diagram [Command read cycle] The basic read cycle is the same as the write cycle above up to the command, followed by the Start condition again. Then, the 7-bit address and read (R) bit is sent, and then the data is read out. S 1st Byte Address+W ・・・・・・・・・ A Command A DATAn-Low A S A 1st Byte Address+R DATAn-High A A DATA0-Low A (PEC) P NA DATA0-High A Figure 7 Command read cycle diagram * In the diagrams above, the white areas indicate the SDA pin as in input, and the gray areas indicate the SDA pin as an output. * The first bit after each 8-bit data is an acknowledge (ACK) bit. The receiver sets the ACK bit Low output (“A”) to indicate it is ready to receive. The receiver sets the ACK bit High output (“NA” = No ACK) when it is not ready to receive. SEIKO NPC CORPORATION - 4 SMH-01B01 1st Byte Data The first byte of data after the Start condition comprises the address and the read/write bit. Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 AD7 AD6 AD5 AD4 AD3 AD2 AD1 R/W (1) This device uses the following address. AD (7:1) 0001-010B: Configuration and data read out 1010-0xxB: (Reserved) (2) Read/Write R/W 1: Data read 0: Data write Command Data (1) Command = 00h Write Only Data bytes: None Stop operation: Stops temperature measurement operation. * In one-shot mode, temperature measurement stops automatically after 1 frame measurement, without needing this command. (2) Command= 01h Data bytes: None Start operation: Write Only Starts temperature measurement operation. (3) Command=02h Read Only Data bytes: 128 bytes (2×64 elements) Read the infrared output data (temperature/voltage). Voltage is in mV units. Temperature output is 10 times the Celsius value, expressed in 2s complement format. (4) Command= 03h Read Only Data bytes: 2 bytes Read the ambient temperature output data (temperature/voltage). Voltage is in mV units. Temperature output is 10 times the Celsius value, expressed in 2s complement format. (5) Command=F0h Read/Write Data bytes: 1 byte Specify the element read order. Sets the read order (1 to 64) of the sensor elements. Bit [7:3]: Tied to 0 (Reserved) Bit 2: Exchanges the vertical and horizontal directions. 0: Read elements from vertical direction to horizontal direction. 1: Read elements from horizontal direction to vertical direction. Bit 1: Reverses the read order in the horizontal direction. 0: Natural order (TP8, TP16 … TP64 rows) 1: Reverse order (TP64, TP56 … TP8 rows) Bit 0: Reverses the read order in the vertical direction. 0: Natural order (TP1, TP2 … TP8 columns) 1: Reverse order (TP8, TP7 … TP1 columns) *If all 3 bits are set to “1”, it first reverses the horizontal direction and vertical direction, and then it exchanges the vertical and the horizontal direction. SEIKO NPC CORPORATION - 5 SMH-01B01 (F0h)=00h: Normal output (F0h)=01h: Output with top/bottom reversed (F0h)=02h: Output with left/right reversed (F0h)=03h: Output with 180° rotation (F0h)=04h: Output with image reflected across TP1 and TP64 diagonal axis (F0h)=05h: Output with 90° clockwise rotation (F0h)=06h: Output with 90° counterclockwise rotation (F0h)=07h: Output with image reflected across TP8 and TP57 diagonal axis (6) Command=F1h Read/Write Data bytes: 1 byte Specify amplifier gain. 0=200, 1= 500, 2=700, 3=1000 4=1200, 5=1500, 6=1700, 7=2000 The default value is 7 (gain of 2000). (7) Command=F2h Read/Write Data bytes: 2 bytes Specify emission adjustment value: Sets correction value with fixed decimal point 1 bit below MSB (0.00006 to 1.99994). Positive values only, using 2s complement format. During emission temperature conversion, the object’s energy coefficient is used as-is in the multiplication. The default value is 1. (8) Command=F7h Read/Write Data bytes: Currently 1 byte only Read: Status read Bit 7: Monitor operation. Bit 6: Infrared output format. Bit 5: Ambient temperature output format Bit 4: Gain setting. Bit 3: PEC code Bit 2: (Reserved: Default is 0) Bit [1:0]: Frame rate Write: Configuration data Bit 7: Operating mode Bit 6: Infrared output format Bit 5: Ambient temperature output format Bit 4: Gain setting Bit 3: PEC code Bit 2: (Reserved: Default is 0) Bit [1:0]: Frame rate 1: Measuring 1: Voltage 1: Voltage 1: Auto adjust 1: Enable 0: Stopped 0: Temperature 0: Temperature 0: Set manually 0: Disable 0= (Off), 1=1fps, 2=2fps, 1: Continuous 1: Voltage 1: Voltage 1: Auto adjust 1: Enable 0: One-shot mode 0: Temperature 0: Temperature 0: Set manually 0: Disable 0= (No change), 1=1fps, 3=4fps 2=2fps, 3=4fps * Default value is 8Ah (settings underlined above). SEIKO NPC CORPORATION - 6 SMH-01B01 PEC Code Polynomial generation (CRC8): Adds remainder derived from G(x) = x8 + x2 + x1 + x0 to detect errors. Automatic Gain Adjustment Function The gain is adjusted automatically when bit 4 of the Configuration Data (Command= 0F7h) is set to “1”. (1) When power is applied initially, the maximum gain of 2000 is set by default. (2) If the output from any sensor element exceeds the maximum level of the internal A/D converter during measurement, the gain is initially switched to the minimum gain of 200. (3) During measurement of the subsequent frame, the reference level is set to approximately half the maximum level of the A/D converter. If the measurement values of all sensor elements do not exceed the reference value, the range is increased one step at a time. (Gain of 200 → 500 → 700 → 1000 → 1200 → 1500 → 1700 → 2000) The increase in range stops when at least one sensor element exceeds the reference level AND all elements do not exceed the maximum level at the current range setting. If the output exceeds the maximum level during range switching, the gain is reduced to the minimum gain of 200 in a single action (the gain is not reduced one step at a time). When bit 4 of the Configuration Data (Command= 0F7h) is set to “0”, the gain is fixed and the gain setting switches to manual adjustment mode. ELEMENT ARRAY AND FIELD-OF-VIEW IMAGE 9.1cm （Peak) 1 2 4.55cm 3 36.4cm 4 35° 5 6 35° 7 8 9 10 11 12 13 14 15 16 50cm 1m 72.8cm 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 41 49 57 （Peak) 50 35 58 43 51 36 59 44 52 37 60 45 53 38 61 46 54 39 62 47 55 40 63 48 56 64 （Peak) 42 Figure 8 Field-of-view image diagram SEIKO NPC CORPORATION - 7 SMH-01B01 TYPICAL APPLICATION CIRCUIT 1k～4.7kΩ (Infrared Input) 0～200Ω SDA Si-Lens SCL I2C-I/F 8x8 Thermopile Array Sensor Module VDD VSS １μF～ 50μF～ 0～390pF (Components within dotted lines included/excluded and adjusted to suit the noise environment.) Figure 9 Typical application circuit * This typical application circuit is provided for reference only, and does not represent a circuit with guaranteed operation. NPC will not be held liable for any loss due to the use of this circuit. Always conduct a thorough evaluation before use. DIMENSIONS Figure 10 External dimensions SEIKO NPC CORPORATION - 8 SMH-01B01 Please pay your attention to the following points at time of using the products shown in this document. 1. The products shown in this document (hereinafter ”Products”) are designed and manufactured to the generally accepted standards of reliability as expected for use in general electronic and electrical equipment, such as personal equipment, machine tools and measurement equipment. The Products are not designed and manufactured to be used in any other special equipment requiring extremely high level of reliability and safety, such as aerospace equipment, nuclear power control equipment, medical equipment, transportation equipment, disaster prevention equipment, security equipment. The Products are not designed and manufactured to be used for the apparatus that exerts harmful influence on the human lives due to the defects, failure or malfunction of the Products. If you wish to use the Products in that apparatus, please contact our sales section in advance. In the event that the Products are used in such apparatus without our prior approval, we assume no responsibility whatsoever for any damages resulting from the use of that apparatus. 2. NPC reserves the right to change the specifications of the Products in order to improve the characteristics or reliability thereof. 3. The information described in this document is presented only as a guide for using the Products. No responsibility is assumed by us for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patents or other rights of the third parties. Then, we assume no responsibility whatsoever for any damages resulting from that infringements. 4. The constant of each circuit shown in this document is described as an example, and it is not guaranteed about its value of the mass production products. 5. In the case of that the Products in this document falls under the foreign exchange and foreign trade control law or other applicable laws and regulations, approval of the export to be based on those laws and regulations are necessary. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies. SEIKO NPC CORPORATION 1-9-9, Hatchobori, Chuo-ku, Tokyo 104-0032, Japan Telephone: +81-3-5541-6501 Facsimile: +81-3-5541-6510 http://www.npc.co.jp/ Email:[email protected] ND15013-E-00 2015.09 SEIKO NPC CORPORATION - 9