Broadcom BCM920732TAG00, Руководство пользователя

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WICED Smart Tag Hardware User Guide Product Description
BROADCOM
®
WICED Smart SDK
August 30, 2013

920732TAG00-HWUM100-R Page 8
Power-Up Options
VDDIO can be sourced from three options:
• Coin cell unregulated
• Coin cell regulated
• USB regulated
These options are set using SW2 and SW3 (see Figure 2 ) as listed in Table 2 . Default regulator output is
1.8V.
Table 2: Switch Settings for Power
Switch Coin Cell Unregulated Coin Cell Regulated USB Regulated
SW2 1-2 (VUSB) 2-3 (VCOIN) 1-2 (VUSB)
SW3 2-3 (VCOIN) 1-2 (VREG) 1-2 (VREG)
To adjust the regulator output, feedback components can be adjusted as shown in Table 3 .
Table 3: Voltage Regulator Output
V
OUT
Component Values
3.3V RFB1=470 kΩ, RFB2=150 kΩ, C22=100 pF
3.0V RFB1=330 kΩ, RFB2=120 kΩ, C22=150 pF
1.8V RFB1=300 kΩ, RFB2=240 kΩ, C22=150 pF
UART Boot-Up
The following procedure describes how to power up the tag board with the UART interface enabled.
1. SW2 and SW3 should be placed in any desired power configuration shown in Table 2.
2. SW4 should be in HCI mode by placing all four switches in the ON position.
3. Plug in the USB cable to connector J6. The Smart Tag should display in the Device Manager as a
COM port named USB Serial Port.
Note : If the device driver does not load correctly, the FT232RL driver must be downloaded
from the FTDI website (see http://www.ftdichip.com/Drivers/VCP.htm ).
The evaluation board can now accept HCI commands or download firmware through the UART interface.