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V1.1 Jan 2019 Datasheet Ag312 Wireless Power Modules © Silver Telecom 2019 Silvertel
1 Features
Qi Compatible (A5 / A11) Low Standby Current Size 33.12mm x 28.65mm x 5.1mm Simple Integration
2 Description
The Ag312 is a wireless power transmitter (A5 / A11) module; designed to work with the Ag301 or any other Qi compliant wireless power receiver, typically used in wireless charging applications. With the i ncreased use of mobile & portable devices , the Ag301 & Ag312 wireless power modules offer a wide range of benefits: - There are n o cables to get tangled and you don’t have the problem of having different plugs or sockets for various devices. There is n o risk of electrical shock , as there are no exposed metal parts . Can be used in explosive environment s as there are n o contacts to cause sparks. This means that there is no contact degradation due to friction, corrosion or abrasion. The units c an be completely s ealed for use in harsh environments , as its operation is not affected by dirt, dust, water or chemicals and can even be used underwater. Can be used in medical envi ronment where d isinfecting and sterilization is required. PbPb
V1.1 Jan 2019 Datasheet © Silver Telecom 2019 Ag312 Wireless Power Modules
2.1 Table of Contents
2.2 Table of Figures
V1.1 Jan 2019 Datasheet © Silver Telecom 2019 Ag312 Wireless Power Modules
3 Ag312 Product Selector†
Part Number Input Voltage Output Voltage Maximum Output Current Type Ag312 5V Transmitter † The Ag312 fully meets the requirements of the RoHS directive 2002/95/E C on the restriction of hazardous substances in electronic equipment. Table 1: Ordering Information Output Driver and CommsSTX17 Internal References Ag312 Comms Filter +Vin -Vin +Vin -Vin Buzzer Shutdown Status 2 Status 1 12C2 5V Power Supply Status Outputs Transmit Coil Ground Plane Figure 1: Ag312 Block Diagram Purchasing Options: Large volume customers of typically 100K+ can purchase the STX17 controller IC on its own and Silvertel will supply the applications circuit so the customer can assemble it themselves.
V1.1 Jan 2019 Datasheet © Silver Telecom 2019 Ag312 Wireless Power Modules
4 Pin Description
4.1 Ag312
+Vin 5V (Supply). These pins connect to an external +5V power supply rail. 2 -Vin 0V (Supply). These pins connect to the 0V return rail of the input power supply. 4 5 Buzzer Buzzer (Output). This pin can be connected to an external buzzer (as shown in Figure 10). 6 Shutdown Shutdown (Input). Pulling this input low, will stop the Ag312 transmitting power. This pin has an internal pull up to a +3.3V rail.
7 Status 2
Status (Outputs). These pins indicate the status of the Ag312.
8 Status 1
C1 Output Coil. These pins connect to the transmitter coil. C2 Coil Return. These pins connect to return of the transmitter coil. Ag312 Top View 8 9 Figure 2: Ag312 Package Format
V1.1 Jan 2019 Datasheet © Silver Telecom 2019 Ag312 Wireless Power Modules
5 Functional Description
5.1 Wireless Power Overview
When the Ag312 wireless transmitter is connected to a 5V supply, it will start up and will commence looking for an Ag301 (or Qi Compatible) wireless receiver in range. It does this by applying a short power signal to the transmit coil to detect an object. If an object is detected then this signal is extended, looking for a “Ping” data message back from the receiver. If a valid “Ping” message is not received, the transmitter will remove the power signal and wait ~500ms before repeating the above process. If a valid “Ping” message is received , the power signal is maintained and the transmitter looks for the “Identification & Configuration” message and the “Power Transfer” message. If either the “Identification & Configuration” or the “Power Transfer” messages are invalid, the transmitter will remove the power signal and wait ~500ms before repeating the above steps. If the transmitter receives valid data, it will maintain and adjust the power signal in accordance with the data sent back from the receiver. The Status 1 output will go to logic 1 and the Buzzer output pin will go to logic 1 for ~500ms, indicating that the power transfer has started. Input Rectification and Comms Driver Output Control and Regulation Circuit Current Sense STX15 Internal Reference +Vdc -Vdc External Load Ag301 Output Driver and CommsSTX17 Internal References Ag312 Comms Filter +Vin -Vin 5V Power Supply Wireless Transmitter Wireless Receiver Energy Data Current Sense Figure 3: Charger Overview
V1.1 Jan 2019 Datasheet © Silver Telecom 2019 Ag312 Wireless Power Modules
5.2 Coils and Alignment
The wireless power connection is established through transmit and receive coil s. For the Ag312 we recommend the following (or equivalent) coil: - TYPE WURTH ELYTONE ELECTRONIC CO. A5 760308105 ETW-00032 A11 (circular) 760308111 760308100111 ETW-00032W The nominal alignment position of the coils is shown below in Figure 4 and 5. In Figure 4 you can see that the coils are separated by the transmitter and receiver enclosures. The Qi specification allows the transmitter enclosure thickness to be between 1.5mm to 2.25mm, and the receiver enclosure thickness to be between 0mm to 2.5mm. The Ag312 has been design ed to meet this specification and the Ag301 is capable of operating well beyond the 2.5mm specification. To Transmitter Ag312 To Receiver Ag301 Receiver Enclosure Transmitter EnclosureTransmitter Coil Receiver Coil Figure 4: Horizontal View Figure 5: Vertical View
V1.1 Jan 2019 Datasheet © Silver Telecom 2019 Ag312 Wireless Power Modules
5.3 Input Power Supply
It is important that the input power su pply used, is a stable regulated 5V supply with low ripple. It is also very important that the voltage drop between the power supply output and the Ag312 input is kept a s low as possible. Using a low quality power supply or high resistance connections can cause operational stability issues. This may result in additional ripple on the output of the receiver, or no operation at all. To ensure that you can get the maximum available power from the receiver, it is important that the input supply has sufficient power (see Section 10.3) . The Ag312 will work with a limited power supply, but if the load tries to draw too much power the Ag312 will shutdown.
5.4 Shutdown Input
The Ag312 has an optional control input: – Shutdown. This input has an internal pull-up to a +3.3V reference. It can be driven directly from a controller (or logic gate) that has a +3.3V rail, or via an external transistor if the external rail is not +3.3V (see Figure 8). It is important that if Figure 8 “O ption A” is used, that the c ontroller output is tri-state or high at start-up. If this is an issue then “Option B” may be a better solution. The transistor does not need to be anything special and the resistors can be high values (100KΩ). Shutdown Ag312 Controller +3.3V Shutdown Ag312 Controller +3.3V Option A Option B +5V +5V Figure 8: Control Inputs When this input is pulled low, the Ag312 will stop sending power and enter into error mode. One of the applications where the Shutdown input can be used is for thermal protection. With one or more thermistors (thermally) connected to the coil, a controller could monitor the temperature and disable the Ag312 if the temperature gets too high.
V1.1 Jan 2019 Datasheet © Silver Telecom 2019 Ag312 Wireless Power Modules
5.5 Status Outputs
The Ag312 module has three status output pins – Buzzer, Status 1 and Status 2. These outputs are all driven from an intern al +3.3V reference and are limited with an internal 10K series resistor (see Figure 9). +3.3V Status Outputs +5V STX17 Buzzer Status 1 Status 2 10K 10K 10K Internal Reference Figure 9: Status Outputs
5.5.1 Buzzer
On successful completion for the start -up communication protocol (as detailed in Section 5.1), this output will go to logic 1 (with reference to the internal +3.3V rail, shown in Figure 9) for a duration of ~500ms. This output can be connected to a Piezoelectric buzzer (as shown in Figure 10) to give an audible indication that the Ag312 has started to supply power to a receiver.
5.5.2 Status 1 & 2
The two Status output pins indicate the operational condition of the Ag312. Table 2 shows the output logic state of these outputs. L ogic 1 is reference d to the internal +3.3V rail and current limited by the internal 10K series resistors (as shown in Figure 9). Ag312 Status Status 1 Output Status 2 Output Idle 0 0 Charging 1 0 Error 0 1 Charge Complete 1 1 Table 2: Status 1 & 2
V1.1 Jan 2019 Datasheet © Silver Telecom 2019 Ag312 Wireless Power Modules
6 Typical Connections
The Ag312 is very easy to implement, Figure 10 shows typical application drawing, giving a basic overview. Shutdown From protection circuit +5V Transmitter Enclosure C1 Tx Coil Buzzer Status 1 Status 2 +Vin -Vin Ag312 R1 R2 R3 LED1 LED2 Piezo Buzzer Ground Plane Figure 10: Typical Application Drawing
7 Typical Applications
The Ag312 can be used in a wide range of wireless power and charging applications and with the increased use of mobile & portable devices this list is expanding every day. At present one of the biggest market sectors for wireless charging are in mobile phones. But there are many more applicatio ns that can benefit from the advantages of wireless power transfer. Because there are no contacts to cause sparks, wireless charging can be used in environments where combustible materials or gases are present. Also as t he transmitter and receiver can be built into completely sealed enclosures ; they can be used in harsh environments, where dust, dirt, water or chemicals are present. On the other end of the spectrum, wireless power also lends itself for use in clean environments, where disinfecting and sterilization is required.
V1.1 Jan 2019 Datasheet © Silver Telecom 2019 Ag312 Wireless Power Modules
8 Operating Temperature
The Ag312 has to drive the output transmission coil, this process does cause the module to generate heat and as a result this will need to be taken into consideration. The amount of heat generated by the module is primarily related to the current being drawn by the receiver. So care needs to be taken to control the ambient temperature around the module. The Ag312 has a maximum ambient operating temperature of 70 °C. These results were preformed in an e nvironmental chamber (Associated Environmental Systems – SD-302), without any heat-sinking. The results shown in Figure 11 are relative to the output power drawn from an Ag301 receiver (used to load the Ag312). -20 -10 0 10 20 30 40 50 60 70 100 400 200 500 300 Ag301 Output Current (mA) Ambient Temperature (°C) 600 700 800 900 1000 Figure 11: Ag312 Operating Temperature Profile
9 Protection
9.1 Input Protection
To protect the Ag312 input from any over -voltage transien ts; we recommend fitting a SMAJ5A directly across the power supply input pins (+Vin and –Vin).
V1.1 Jan 2019 Datasheet © Silver Telecom 2019 Ag312 Wireless Power Modules
10.1 Absolute Maximum Ratings*
Parameter Symbol Min Max Units
1 Storage Temperature TS -40 +100 °C
2 DC Supply Voltage Surge for 1ms VSURGE -0.3 25 V 3 Shutdown Input Maximum DC Rating VSMAX -0.3 3.5 V *Exceeding the above ratings may cause permanent damage to the product. Functional operation under these conditions is not implied. Maximum ratings assume free airflow.
10.2 Recommended Operating Conditions
Parameter Symbol Min Typ Max Units
1 Operating Temperature TOP -20 25 70† Ta / °C
2 Input Voltage Range VIN 4.75 5.25 V †See Section 8
10.3 DC Electrical Characteristics*
DC Characteristic Sym Min Typ* Max Units Test Comments
1 Input Voltage VIN 5 V
2 Input Current - Idle IIDLE 8.5 mA
3 Input Current - Max
Load IML 1700 mA With TI RX Load = 1A 4 Peak Efficiency EFF 71.15 % With TI RX
5 Maximum Start Up
Distance Between Coils DST 11.5 mm @ Full Load with TI RX
6 Maximum Operating
Distance Between Coils DOP 12.3 mm @ Full Load with TI RX
7 Shutdown Input Logic
Low Voltage VIL 0.75 V
8 Shutdown Input Logic
High Voltage VIH 2.25 V *Typical figures are at 25°C and are for design aid only. Not Guaranteed
V1.1 Jan 2019 Datasheet © Silver Telecom 2019 Ag312 Wireless Power Modules 26.01 28.65 1.623 7.67 2.54 25.45 2.64 30.48 33.12 2.54 2.64 27.023 1.6 Max 2.0 Dimensions (in mm) are nominal unless otherwise stated 3.2 Ø fixing holes1 8 9 2.64 Information published in this datasheet is believed to be correct and accurate. Silver Telec om assumes no liability for errors which may occur or for liability otherwise arising out of use of this information or infringement of patents which may occur as a resul t of such use. No license is granted by this document under patents owned by Silver Te lecom or licensed from third parties by Silver Telecom. The products, their specification and information appearing in this document are subject to change by Silver Telecom without notice.