G
-TW
-0007447
.2.2
CSR8640
SPI Flash
SPI
PS Keys
Programmable
Audio Prompts
Patches
Configuration
Figure 16.1: Programmable Audio Prompts in External SPI Flash
G
-TW
-0
007448
.1.1
CSR8640
EEPROM
I
2
C
PS Keys
Programmable
Audio Prompts
Patches
Configuration
Figure 16.2: Programmable Audio Prompts in External I²C EEPROM
Note:
When using the SPI flash interface for programmable audio prompts, an EEPROM device is not required in the
CSR8640 stereo headset.
16.1.7
CSR’s Intelligent Power Management
IPM extends the available talk time of a CSR8640 BGA-based headset, by automatically reducing the audio
processing performed by CVC at a series of low battery capacity thresholds.
Configurable IPM features include:
■
IPM enable/disable
■
The battery capacity that engages IPM
■
A user-action to enable or disable the IPM
If engaged, CVC processing reduces automatically on reaching the preset battery capacity. Once the audio is
terminated, the DSP shuts down to achieve maximum power savings before the next call.
IPM resets when recharging the headset. The talk time extension depends on:
■
The battery size
■
The battery condition
■
The threshold capacity configured for the IPM to engage
Advance Information
This material is subject to CSR's non-disclosure agreement
© Cambridge Silicon Radio Limited 2011
Page 95 of 110
CS-209182-DSP1
CSR8640 BGA
Data Sheet
