Datasheet DS000677 AS621x Digital Temperature Sensor v2-00 • 2020-Feb-24
Document Feedback AS621x Content Guide Content Guide 1 General Description....................... 3 1.1 1.2 1.3 Key Benefits & Features .............................. 3 Applications .................................................. 4 Block Diagram .............................................. 4 2 Ordering Information ..................... 5 3 Pin Assignment ............................. 6 3.1 3.2 Pin Diagram .................................................. 6 Pin Description ..................
Document Feedback 1 AS621x General Description General Description The AS621x IC family is a high accuracy temperature sensor system that communicates via a 2-wire digital bus with other devices. It consists of a Si bandgap temperature sensor, an ADC and a digital signal processor. The family consists of 3 different variants (AS6212, AS6214 and AS6218). The difference between these variants is the temperature accuracy: Figure 1: AS621x Variants Variant Temperature Accuracy Remark AS6212 ±0.
Document Feedback 1.2 Benefits Features Low Power Consumption 6 µA @ Operation (typical, @ 4 Hz) 0.1 µA @ Standby (typical) Supply Voltage Range 1.71 – 3.6 V (0 °C to 125 °C) Small PCB Footprint 1.5 mm x 1 mm (WLCSP) Applications ● Electronic Equipment ● ● ● ● ● ● 1.
Document Feedback 2 AS621x Ordering Information Ordering Information Ordering Code Package Marking Delivery Form Delivery Quantity AS6212-AWLT-S WLCSP AS6212 Tape & Reel 500 pcs/reel AS6212-AWLT-L WLCSP AS6212 Tape & Reel 5000 pcs/reel AS6214-AWLT-S WLCSP AS6214 Tape & Reel 500 pcs/reel AS6214-AWLT-L WLCSP AS6214 Tape & Reel 5000 pcs/reel AS6218-AWLT-S WLCSP AS6218 Tape & Reel 500 pcs/reel AS6218-AWLT-L WLCSP AS6218 Tape & Reel 5000 pcs/reel Datasheet • PUBLIC DS000677
Document Feedback 3 Pin Assignment 3.1 Pin Diagram AS621x Pin Assignment Figure 4: Pin Assignment WLCSP In Figure 4 the pin assignment of the WLCSP package is shown. The viewing side is from the top. The A1 pin is also marked with a point on the top side 3.
Document Feedback Pin Number Pin Name Pin Type(1) Description B3 SDA DIO_SOD Serial Interface Data (1) AS621x Pin Assignment Explanation of abbreviations: S Supply DI_S Digital Schmitt Trigger Input DIO_SOD Digital Schmitt Trigger Input / Open Drain Output In Figure 5 the pins of AS621x are described. External pull up resistors (to VDD) are necessary for the pins “SDA” and “SCL”. The pin “ADD0” must not be left unconnected (refer to section 6.3.3 for further details).
Document Feedback 4 AS621x Absolute Maximum Ratings Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated under “Operating Conditions” is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Document Feedback 5 AS621x Operating Conditions Operating Conditions The AS621x is a complete sensor system that has an integrated sensing element, the analog frontend, the A/D converter and the digital signal processing part. The digital signal processing part consists of the signal processor, the registers and the serial bus interface. 5.1 Analog System Parameters Figure 7: Analog System Parameters of AS621x Parameter Symbol Min Typ Max Unit Note Supply Voltage VDD 1.71 2.0 3.0 3.0 3.6 3.
Document Feedback AS621x Operating Conditions Figure 8: Temperature Accuracy Values of AS621x Variant Symbol Min AS6212 T_ERR -0.3 -0.2 -0.3 -0.5 AS6214 T_ERR AS6218 T_ERR Typ Max Unit Note 0.3 0.2 0.3 0.5 °C T= -40°C to -10°C T= -10°C to 65°C T= 65°C to 85°C T= 85°C to 125°C -1.0 -0.4 -1.0 1.0 0.4 1.0 °C T= -40°C to 0°C T= 0°C to 65°C T= 65°C to 125°C -1.0 -0.8 -1.0 1.0 0.8 1.
Document Feedback 6 Register Description 6.1 Register Overview AS621x Register Description Figure 10 : Register Map with Serial Interface In Figure 10 the registers that the device contains are shown. With the use of the index register, it is possible to address the specific register. The index register is an 8-bit register, where only bits 0 and 1 are used as shown in Figure 11 and all other bits are set to 0 and read only 6.1.
Document Feedback AS621x Register Description Figure 12: Register Map Address Symbol Register Description 0x0 TVAL Temperature Register Contains the temperature value 0x1 CONFIG Configuration Register Configuration settings of the temperature sensor 0x2 TLOW TLOW Register Low temperature threshold value 0x3 THIGH THIGH Register High temperature threshold value The first 2 bit addresses in the index register define the access to the registers shown in Figure 12.
Document Feedback AS621x Register Description Addr: 0x1 Bit Bit Name Default Access Bit Description 14 Reserved 1 RO Reserved 15 SS 0 RW Single Shot The configuration register is a 16-bit register which defines the operation modes of the device. Any read/write operation processes the MSB byte first. In Figure 13 the configuration register is shown. The bits 0-4 and 13-14 are not to be used and are set to read only. The explanation of the other bits are detailed in the following sections.
Document Feedback 6.2.3 AS621x Register Description Conversion Rate Bits The conversion rate bits define the number of executed temperature conversions per time unit. Additional readouts of the temperature register between conversions are possible but not recommended because the value is changed only after a conversion is finished. Values of 125ms, 250ms, 1s and 4s for a conversion can be configured while the default rate is set to 4 conversions per second.
Document Feedback AS621x Register Description The serial interface is the only active circuitry in the sleep mode in order to provide access to the digital registers. Entering the sleep mode will take some time (120 ms maximum) and the first conversion after the sleep mode has been entered takes longer than the values specified in Figure 7. It is therefore recommended when entering sleep mode to trigger a single shot conversion at the same time.
Document Feedback AS621x Register Description Figure 19: Alert Output Functionality 6.2.6 Polarity Bit The polarity bit configures the polarity of the ALERT output. If the polarity bit is cleared, the ALERT output is low active while it becomes high active if the polarity bit is set to ‘1’.
Document Feedback 6.2.7 AS621x Register Description Consecutive Faults A fault condition persists if the measured temperature either exceeds the configured value in register THIGH or falls below the defined value in register TLOW. As a result, the ALERT pin indicates the fault condition if a defined number of consecutive temperature readings meets this fault condition.
Document Feedback 6.2.9 AS621x Register Description High and Low Limit Registers If the comparator mode is configured (IM=0), the ALERT output becomes active if the temperature equals or exceeds the defined value in register THIGH for the configured number of consecutive faults (N). This configuration is defined by the field CF in the configuration register.
Document Feedback AS621x Register Description Figure 23: Alert Operation Modes Comparator Mode ALERT output cleared T ≤ TLOW for N consecutive cycles T ≥ THIGH for N consecutive cycles ALERT output active General Reset Command IM=0 IM=1 Interrupt Mode Read operation or Set to sleep mode ALERT output cleared ALERT output active T ≤ TLOW for N consecutive cycles T ≥ THIGH for N consecutive cycles ALERT output active ALERT output cleared Read operation or Set to sleep mode The following table
Document Feedback AS621x Register Description Figure 24: Default Values for THIGH and TLOW Register Temperature Binary Value TLOW 75 °C 0010 0101 1000 0000 THIGH 80 °C 0010 1000 0000 0000 The following table defines the register bits of the THIGH and TLOW register.
Document Feedback 6.2.10 AS621x Register Description Temperature Register (Address 0x0) Figure 26: Temperature Value Register Addr: 0x0 Bit Bit Name 0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13 14 T14 15 T15 The temperature register contains the digitally converted temperature value and can be read by setting the index pointer to the TVAL register (0x0). Two consecutive bytes must be read to obtain the complete temperature value.
Document Feedback AS621x Register Description Example 75°C: 75°𝐶/0.0078125°𝐶 = 9600 = 𝐵𝑖𝑛𝑎𝑟𝑦 0010 0101 1000 0000 = 𝐻𝑒𝑥 2580 Example -40°C: |−40°𝐶|/0.0078125 °𝐶 + 1 = 5120 + 1 = 𝐵𝑖𝑛𝑎𝑟𝑦 0001 0100 0000 0000 + 1 = 1110 1100 0000 0000 = 𝐻𝑒𝑥 EC00 Figure 27: Temperature Conversion Examples 6.3 Temperature (°C) Digital Output (Binary) Digital Output (Hex) 100.0 0011 0010 0000 0000 3200 75.0 0010 0101 1000 0000 2580 50.0 0001 1001 0000 0000 1900 25.0 0000 1100 1000 0000 0C80 0.
Document Feedback AS621x Register Description In order to address a specific device, a START condition has to be generated by the master device by pulling the data line (SDA) from a logic high level to a logic low level while the serial clock signal (SCL) is kept at high level. After the start condition, the slave address byte is transmitted which is completed with a ninth bit which indicates a read (bit=’1’) or a write operation (bit=’0’) respectively.
Document Feedback AS621x Register Description Figure 28: I²C Address Select Configuration 6.3.
Document Feedback AS621x Register Description Similarly to the byte transfer where the MSB is transmitted first, the transfer of a 16-bit word is executed by a two byte transfer whereas the MSB byte is always transmitted first. 6.3.5 Slave Operation The device employs a slave functionality only (slave transmitter and slave receiver) and cannot be operated as a bus master. Consequently, the device never actively drives the SCL line. 6.3.
Document Feedback AS621x Register Description Figure 29: Alert Condition Bit 6.3.9 Polarity Bit Alert Condition Alert Condition Bit (AC-Bit) 0 T ≥ THIGH 0 0 T ≤ TLOW 1 1 T ≥ THIGH 1 1 T ≤ TLOW 0 High Speed Mode The bus operation is limited to 400kHz unless a high speed command is issued by the master device as the first byte after a START condition. This switches the bus to a high speed operation which allows data transfer frequencies up to 3.4MHz.
Document Feedback 6.3.13 AS621x Register Description Bus Conditions The following conditions occur on the serial bus which is compatible to the I²C-Bus. Bus Idle The signals SDA and SCL are not actively driven and pulled to a high level by an external pull-up resistor. Start Data Transfer A transition of the SDA input from high to low level while the SCL signal is kept at high level results in a START condition. Such a START condition must precede any data transfer.
Document Feedback 6.3.14 AS621x Register Description Timing Characteristics Figure 30: Serial Interface Timing Diagram Figure 31: Bus Timing Specifications Parameter Symbol Fast Mode High Speed Mode Min Max Min Max 0.4 0.001 3.4 Unit SCL clock frequency fSCL 0.
Document Feedback 6.3.
Document Feedback AS621x Register Description Figure 33: Timing Diagram for Word Read Frame 1 : Slave Address Byte Frame 2 : Index Register Byte 1 2 3 4 5 6 7 8 1 0 0 A3 A2 A1 A0 R /W 9 1 2 3 4 5 6 7 8 0 0 0 0 0 0 IX 1 IX 0 9 SCL SDA Start by master Values are defined Values are defined by ADD 0 pin setting by ALERT/ADD1 pin setting Frame 3: Slave Address Acknowledge by slave Acknowledge by slave Byte Frame 4 : Register MSB 1 2 3 4 5 6 7 8 1 0 0 A3 A
Document Feedback 7 AS621x Application Information Application Information Figure 34: Application Example VDD RPU Serial Interface Pull-up resistors SDA Address Select 0 ALERT Interrupt Microcontroller (Bus Master) ADD0 VDD VDD AS621x Slave SCL ADD1/ ALERT Address Select 1 VSS 10nF In Figure 34 the connections of the AS621x temperature sensors to a microcontroller and the supply voltage are shown. The AS621x is connected to a microcontroller via an I²C bus (SDA and SCL only).
Document Feedback 7.1 AS621x Application Information External Components Figure 35: Schematic with External Components VDD RPU Pull-up resistors SCL SDA SDA Address Select 0 ADD0 VDD VDD AS621x Slave SCL ADD1/ ALERT Address Select 1 VSS 10nF Alert Figure 36: Values for External Components Parameter Min Decoupling capacitor 10 Pull up resistors Typ Unit nF 10 kΩ In Figure 35 and Figure 36 the schematics and the recommended values for external components are shown.
Document Feedback 8 AS621x Package Drawings & Markings Package Drawings & Markings Figure 37: WLCSP Outline Drawing Ref. Min Nom Max X 1475 1495 1515 Y 1005 1025 1045 ax 347.5 dx 400 ay 312.5 dy 400 d 250 Thickness (with balls before reflow) 600 RoHS Green (1) (2) (3) (4) All dimensions are in micrometers. Angles in degrees. Dimensioning and tolerance conform to ASME Y14.5M-1994. This package contains no lead (Pb). This drawing is subject to change without notice.
Document Feedback AS621x Package Drawings & Markings Figure 38: WLCSP Package Marking/Code for AS6212 XXXX AS6212 XXXX Tracecode XXXX Tracecode XXXX Tracecode Figure 39: WLCSP Package Marking/Code for AS6214 XXXX AS6214 Figure 40: WLCSP Package Marking/Code for AS6218 XXXX AS6218 Datasheet • PUBLIC DS000677 • v2-00 • 2020-Feb-24 36 │ 34
Document Feedback 9 AS621x Revision Information Revision Information ● ● Document Status Product Status Definition Product Preview Pre-Development Information in this datasheet is based on product ideas in the planning phase of development. All specifications are design goals without any warranty and are subject to change without notice Preliminary Datasheet Pre-Production Information in this datasheet is based on products in the design, validation or qualification phase of development.
Document Feedback 10 AS621x Legal Information Legal Information Copyrights & Disclaimer Copyright ams AG, Tobelbader Strasse 30, 8141 Premstaetten, Austria-Europe. Trademarks Registered. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its General Terms of Trade.
