BCM20730 Datasheet, PDF (28/62 Pages) Cypress Semiconductor – Single-Chip Bluetooth Transceiver for Wireless Input Devices

BCM20730 Data Sheet
GPIO Port
Parameter
Symbol
Output
frequency
F_oscout
Frequency
–
tolerance
Start-up time T_startup
XTAL drive level P_drv
XTAL series
resistance
XTAL shunt
capacitance
R_series
C_shunt
Table 6: XTAL Oscillator Characteristics
Conditions
–
Minimum
–
Typical
32.768
Crystal dependent –
100
–
–
–
For crystal
0.5
–
selection
For crystal
–
–
selection
For crystal
–
–
selection
Maximum Unit
–
kHz
–
ppm
500
ms
–
μW
70
kΩ
1.3
pF
GPIO Port
The BCM20730 has 14 general-purpose I/Os (GPIOs) in the 32-pin package, 22 GPIOs in the 40-pin package, and
40 GPIOs in the 64-pin package. All GPIOs support programmable pull-up and pull-down resistors, and all
support a 2 mA drive strength except P26, P27, P28, and P29, which provide a 16 mA drive strength at 3.3V
supply.
Port 0–Port 1, Port 8–Port 23, and Port 28–Port 38
All of these pins can be programmed as ADC inputs.
Port 26–Port 29
P[26:29] consists of four pins. All pins are capable of sinking up to 16 mA for LED. These pins also have the PWM
function, which can be used for LED dimming.
PWM
The BCM20730 has four internal PWM channels. The PWM module consists of the following:
• PWM1–4
• Each of the four PWM channels, PWM1–4, contains the following registers:
– 10-bit initial value register (read/write)
– 10-bit toggle register (read/write)
– 10-bit PWM counter value register (read)
BROADCOM ®
September 9, 2013 • 20730-DS108-R
BROADCOM CONFIDENTIAL
Page 27