Device Details
Bluetooth low energy
■
Dual-mode Bluetooth low energy radio
■
Support for Bluetooth basic rate / EDR and low
energy connections
■
3 Bluetooth low energy connections at the same time
as basic rate A2DP
Bluetooth Radio
■
On-chip balun (50Ω impedance)
■
No production trimming of external components
■
Bluetooth v4.0 specification compliant
Bluetooth Transmitter
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8dBm (typ) RF transmit power with level control
■
Class 1, Class 2 and Class 3 support, no external
PA or TX/RX switch required
Bluetooth Receiver
■
-91dBm (typ) π/4 DQPSK receiver sensitivity and
-81dBm (typ) 8DPSK receiver sensitivity
■
Integrated channel filters
■
Digital demodulator for improved sensitivity and co-
channel rejection
■
Real-time digitised RSSI available to application
■
Fast AGC for enhanced dynamic range
■
Channel classification for AFH
Bluetooth Synthesiser
■
Fully integrated synthesiser requires no external
VCO, varactor diode, resonator or loop filter
■
Compatible with crystals 16MHz to 32MHz
Kalimba DSP
■
Enhanced Kalimba DSP coprocessor, 80MIPS,
24‑bit fixed point core
■
2 single-cycle MACs; 24 x 24-bit multiply and 56-bit
accumulator
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32-bit instruction word, dual 24-bit data memory
■
6K x 32-bit program RAM including 1K instruction
cache for executing out of internal ROM
■
16K x 24-bit + 16K x 24-bit 2-bank data RAM
Audio Interfaces
■
Stereo audio ADC with line input
■
Stereo audio DAC
■
Supported sample rates of 8, 11.025, 16, 22.05, 32,
44.1, 48 and 96kHz (DAC only)
Auxiliary Features
■
Crystal oscillator with built-in digital trimming
Package Option
■
68-lead QFN 8 x 8 x 0.9mm 0.4mm pitch
Physical Interfaces
■
UART interface for debug
■
USB 2.0 (full-speed) interface, including charger
enumeration
■
1-bit SPI flash memory interface
■
SPI interface for debug and programming
■
I²C interface for EEPROM
■
Up to 20 general purpose PIOs with 3 extra open-
drain PIOs available when LED not used
■
PCM and I²S (only in HCI mode) interfaces
■
3 LED drivers (includes RGB) with PWM flasher
independent of MCU
Integrated Power Control and Regulation
■
Automatic power switching to charger when present
■
2 high-efficiency switch-mode regulators with 1.8V
and 1.35V outputs direct from battery supply
■
3.3V linear regulator for USB supply
■
Low-voltage linear regulator for internal digital circuits
■
Low-voltage linear regulator for internal analogue
circuits
■
Power-on-reset detects low supply voltage
■
Power management includes digital shutdown and
wake-up commands for ultra-low power modes
Battery Charger
■
Lithium ion / Lithium polymer battery charger
■
Instant-on function automatically selects the power
supply between battery and USB, which enables
operation even if the battery is fully discharged
■
Fast charging support up to 200mA with no external
components. Higher charge currents using external
pass device.
■
Supports USB charger detection
■
Support for thermistor protection of battery pack
■
Support to enable end product design to PSE law:
■
Design to JIS-C 8712/8714 (batteries)
■
Testing based on IEEE 1725
Baseband and Software
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Internal ROM
■
Memory protection unit supporting accelerated VM
■
56KB internal RAM, enables full-speed data transfer,
and full piconet support
■
Logic for forward error correction, header error
control, access code correlation, CRC,
demodulation, encryption bit stream generation,
whitening and transmit pulse shaping
Production Information
© Cambridge Silicon Radio Limited 2013
Page 2 of 4
CS-303199-TOP2
www.csr.com
CSR8635 QFN
Technical Overview
