Product Drawings
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.
72.6.2.1.3 Supply Voltage (DC)
1.
Configure the oscilloscope as follows:
●
Horizontal scale: 1 ms/div
●
Vertical scale: 1 V/div
●
Channel coupling: DC
2.
With electronic load set to CC mode, record the average VBUS voltage on the scope for each load
from 0 A to 1 A in 200 mA steps.
3.
Verify that all recorded values are within 4.75 V and 5.40 V.
72.6.2.1.4 Supply Voltage Ripple
1.
Configure the oscilloscope as follows:
●
Horizontal scale: 1 ms/div
●
Vertical scale: 10 mV/div
●
Channel coupling: AC
2.
With electronic load set to CC mode, record the peak-peak VBUS voltage on the scope using
cursors for each load from 0 A to 1 A in 200 mA steps. Capture at least 10 cycles and measure the
worst-case peak-peak voltage, adjusting the horizontal scale if necessary based on the frequency
of the ripple.
3.
Verify that all recorded values are below 20 mV.
72.6.2.1.5 Overcurrent Protection (OCP)
1.
Configure the oscilloscope as follows:
●
Horizontal scale: 1 ms/div
●
Vertical scale: 1 V/div
●
Channel coupling: DC
2.
With electronic load set to CC mode, observe the average VBUS voltage on the scope as the load
is varied from 1.4 A to 1.6 A in 10 mA increments.
2022-04-26 | Copyright © 2022 Apple Inc. All Rights Reserved.
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72.6 Test Procedures