72. Apple Watch Charger Module The Watch Charger Module (C162) enables accessories to charge the Apple Watch. Figure 72-1 Watch Charger Module 72.1 Accessory Integration All C162 accessories shall: ● Provide power to Apple Watch. See Electrical (page 658 ). ● Hold the Apple Watch when it is magnetically connected to the C162. ● Permit the Apple Watch to move relative to the C162. ● Be intended for stationary use.
72. Apple Watch Charger Module 72.2 Mechanical The accessory should be compatible with all Apple bands including the Milanese Loop and the Link Bracelet. To avoid interference with Apple Watch bands, accessories should: ● Not exceed 20 mm in radius around the center of the C162 surface if the Apple Watch can be attached in any orientation.
72. Apple Watch Charger Module 72.2 Mechanical ● ● If mounted horizontally, the surface shall be mounted such that it cannot be positioned or oriented greater than 45° from horizontal. If mounted vertically, the surface shall have a non-adjustable mounting angle. Additionally, the accessory shall support any model of Apple Watch as well as band on its side (crown up) with a pocket or alignment feature that ensures the center of the Apple Watch aligns with the center of the C162 surface within ±1.0 mm.
72. Apple Watch Charger Module 72.3 Electrical 72.3 Electrical Accessories integrating a C162 shall comply with the electrical requirements in this section. 72.3.1 Power Accessories integrating a C162 shall provide power from either: ● An internal power supply. ● An external USB power source.
72. Apple Watch Charger Module 72.3 Electrical 72.3.1.2 External USB Power Source Accessories relying on an external USB power source to provide power to the C162 shall: ● Have maximum 500 mΩround trip DCR (USB VBUS to Ground) between the C162 and the accessory's USB-A plug or USB-C Plug (page 811). ● Pass the USB-IF Full Speed signal quality test. See Full Speed USB (page 808 ) and Full Speed USB (page 819). ● Meet the USB-IF inrush current specification of 51.5 μC.
72. Apple Watch Charger Module 72.4 Factory Configuration ● ● ● Use a 4-pin 0.050" micro pitch connector attached to a cable. Solder pins directly to a PCB using through-hole mounting. The pins shall not be reflow soldered, but shall be manually soldered with heat contained to the pin region. Solder wires directly to the pins. Micro pitch connectors are available from Samtec (https://www.samtec.com) and others. 72.3.
2. Apple Watch Charger Module 72.4 Factory Configuration 72.4.
72. Apple Watch Charger Module 72.4 Factory Configuration Response : 72.4.1.3 Set Model Number Description : Sets the Model Number string. Format : [SetMN- modelNumber ] Parameters : ● modelNumber: A string representation of the model number from the manufacturer (up to 32 UTF8 characters). Example : [SetMN-ABC 123] Response : 72.4.1.4 Set Serial Number Description : Sets the Serial Number string.
72. Apple Watch Charger Module 72.4 Factory Configuration Format : [SetUP- productID ] Parameters : ● productID: A string representation of the hex value of the product ID from the manufacturer, without the 0x prefix. Example : [SetUP-0000] Response : 72.4.1.7 Lock Configuration Description : Locks the configuration for production use. Format : [LkCfg- mode] Parameters : ● mode: ● 1 = Test configuration on the next boot.
72. Apple Watch Charger Module 72.4 Factory Configuration 72.4.2.2 Configure and Test The following is an example factory configuration sequence which tests the settings in production mode, but does not permanently lock the C162: 1. Apply power to the C162 and connect to USB VCP interface. 2. Issue all [Set XX] commands to configure the module. 3. Issue [LkCfg-1] (next boot will come up in production mode). 4. Cycle power. 5. The C162 boots, enumerating using the configured parameters. 6.
72. Apple Watch Charger Module 72.4 Factory Configuration If the VCP is not identified properly upon connection, update the driver using the Windows Device Manager. If the accessory is listed as a Composite device, select it and update the driver (choose "Have Disk", and browse to the folder containing the updatedstmcdc.inf file). 2022-04-26 | Copyright © 2022 Apple Inc. All Rights Reserved.
72.5 Watch Charger Module Dimensions 2022-04-26 | Copyright © 2022 Apple Inc. All Rights Reserved.
72.6 Test Procedures 72.6 Test Procedures Test procedures for accessories integrating the C162 are contained in this section. Tests should be performed with an Apple Watch 44 mm Stainless Steel Case with Link Bracelet. 72.6.1 Mechanical This section contains mechanical test procedures for accessories integrating the C162. 72.6.1.1 Product Design 1. Verify that the accessory: Is intended for stationary use. b. Does not require the watch band to be removed or detached. c.
72.6 Test Procedures 72.6.2.1.1 Equipment The following equipment is needed for performing the electrical test procedures: ● Electronic load rated at 10 W or higher, capable of constant current (CC) mode. ● Oscilloscope with 100 MHz or higher bandwidth. 72.6.2.1.2 Test Setup 1. Disconnect the C162 from the accessory's 4-pin connector. 2. Connect the electronic load and the oscilloscope channel to VBUS and GND pins on the connector. 3. Connect the accessory to the power source. 72.6.2.1.
72.6 Test Procedures 3. Verify that the VBUS voltage reading on the scope falls within 4.75 V and 5.4 V with the electronic load setting of 1.4 A and the output current draw falls to less than 20 mA with the electronic load setting of 1.5 A ±2% (between 1.47 A and 1.53 A). 72.6.2.2 External USB Power Sources This section contains electrical test procedures for accessories using external USB power sources. 72.6.2.2.
72.6 Test Procedures 9. Connect the negative lead of the DMM to the USB plug's GND pin on the breakout board. 10. Record the voltage, V GND in mV, from the DMM. 11. Calculate the total resistance: DCR = (V VBUS + VGND ) / 100 72.6.2.2.5 USB-C CC Pull-Down Use the USB-C receptacle breakout board. 1. Configure the DMM to perform a resistance measurement. 2. Connect the positive lead of the DMM to the USB plug's CC pin on the breakout board. 3.
