BCM20705 Datasheet, PDF (28/67 Pages) Cypress Semiconductor – Single-Chip Bluetooth Transceiver and Baseband Processor

BCM20705 Data Sheet
One-Time Programmable Memory
Contents
The following are typical parameters programmed into the OTP memory:
• BD_ADDR
• Software license key
• USB PID/VID
• USB bus/self-powered status
• Output power calibration
• Frequency trimming
• Initial status LED drive configuration
The OTP contents also include a static error correction table to improve yield during the programming process
as well as forward error correction codes to eliminate any long-term reliability problems. The OTP contents
associated with error correction are not visible by customers.
Programming
OTP memory programming takes place through a combination of Broadcom software integrated with the
manufacturing test software and code embedded in BCM20705 firmware.
Programming the OTP requires a 3.3V supply. The OTP programming supply comes from the VDD_USB pin.
For applications where the OTP is most useful, such as the USB transport application for the PC market, the
3.3V is already required for USB operation from the VDD_USB pin. The OTP power supply is allowed to be as
low as 1.8 V to be able to read the contents. See Table 2 for the OTP memory programming supply voltage
requirements.
The OTP is enabled by default by setting OTP_DIS to low using an internal pull-down resistor. Leave this pin
floating for a default configuration. To disable the OTP, set the OTP_DIS pin to active high. This pin can be
configured from the HW to enable or disable OTP.
Typically it won’t be necessary to disable the OTP memory, even if it is not programmed during manufacturing.
The OTP_DIS package ball only needs to be tied to high if recommended by Broadcom.
Table 2: OTP Programming Supply Voltage Requirements^a
Supply
Minimum^b
Typical
Maximum^b
Unit
VDD_USB
TBD
TBD
TBD
V
a. The average and peak current consumptions during OTP memory programming are 20 mA and 70 mA,
respectively.
b. Contact your Broadcom representative for recommended minimum and maximum supply voltages.
Broadcom®
Bluetooth Transceiver and Baseband Processor
November 13, 2014 • MCS20705-DS104-R
Page 27
BROADCOM CONFIDENTIAL