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Google Home 拆解

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Adım 6
Google Home Teardown: adım 0, 3 resimden 1. Google Home Teardown: adım 0, 3 resimden 2. Google Home Teardown: adım 0, 3 resimden 3.

  • Here's the source of our board removal strife: A layer of super sticky adhesive, keeping the capacitive board in contact with the plastic upper case.

  • This round green grid is half of an array of capacitors—with the other half buried in another, deeper PCB layer. By measuring the total capacitance of each row and column, the controller can detect when—and pinpoint where—your finger is modifying the capacity of the grid through capacitative coupling. Science!

  • This side of the board also hosts an array of 12 status LEDs.

  • On the backside we find some chips:

  • Atmel ATSAMD21 32-bit ARM Cortex-M0+ microcontroller

  • Two NXP PCA9956BTW LED drivers

  • Two InvenSense INMP621 MEMS microphones—will only two be enough compared to the Echo's seven?

  • Ambient Light Sensor

这是我们拆解这么费劲的根源：一层超级粘接剂，用来保持电容板与塑料上壳表面的接触。

这个圆形绿色栅格是一个电容阵列的一半-另一半埋在PCB更深的一层。通过测量每一行和每一列的总电容，控制器可以通过电容耦合来检测你的手指什么时候、在什么位置改变了电容的大小。科学的力量！

板的这一侧也有12个状态LED灯的阵列。

在背面我们发现了一些芯片：

Atmel ATSAMD21 32位 ARM Cortex-M0 + 微控制器

2个NXP的 PCA9956BTW LED 驱动器

2个InvenSense的INMP621 MEMS麦克风—和Echo的7个比起来，2个够么？

[* black] Here's the source of our board removal strife: A layer of super sticky adhesive, keeping the capacitive board in contact with the plastic upper case.
[* icon_note] This [http://www.mouser.com/ds/2/42/gpio_module_datasheet-768579.pdf|round green grid|new_window=true] is half of an array of capacitors—with the other half buried in another, deeper PCB layer. By measuring the total capacitance of each row and column, the controller can detect when—and pinpoint where—your finger is modifying the capacity of the grid through capacitative coupling. [https://en.wikipedia.org/wiki/Capacitive_sensing|Science|new_window=true]!
[* red] This side of the board also hosts an array of 12 status LEDs.
[* black] On the backside we find some chips:
[* red] Atmel [http://www.atmel.com/Images/Atmel-42181-SAM-D21_Datasheet.pdf|ATSAMD21|new_window=true] 32-bit ARM [https://www.arm.com/products/processors/cortex-m/cortex-m0plus.php|Cortex-M0+|new_window=true] microcontroller
[* orange] Two NXP [http://www.nxp.com/products/power-management/lighting-driver-and-controller-ics/i2c-led-display-control/24-channel-fm-plus-ic-bus-57-ma-20-v-constant-current-led-driver:PCA9956BTW|PCA9956BTW|new_window=true] LED drivers
[* yellow] Two InvenSense [https://www.invensense.com/products/digital/inmp621/|INMP621|new_window=true] MEMS microphones—will only two be enough compared to the [guide|33953|Echo's|stepid=79355|new_window=true] seven?
+ [* green] Ambient Light Sensor

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