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One-Time Programmable Memory

BCM20705 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

Bluetooth Transceiver and Baseband Processor

November 13, 2014 • MCS20705-DS104-R

Page 27

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 Requirementsa

a. The average and peak current consumptions during OTP memory programming are 20 mA and 70 mA,

respectively.

Supply

Minimumb

b. Contact your Broadcom representative for recommended minimum and maximum supply voltages.

Typical

Maximumb

Unit

VDD_USB

TBD

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