STA2500DTR STMICROELECTRONICS [STMicroelectronics], STA2500DTR Datasheet - Page 29

• Manufacturer Part Number: STA2500DTR
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STA2500D
6.9
6.10
6.10.1
Table 24.
Complete Power Down
Low power mode
Deep Sleep mode
Sleep mode
Interrupts
The user can program the BT_GPIOs as external interrupt sources.
Low power modes
Overview
To save power, three low power modes are supported as described in
Depending of the Bluetooth and of the Host's activity, the STA2500D decides to use Sleep
mode or Deep Sleep mode. Note however that the Deep Sleep mode must first be activated
via SW parameter download or an HCI command prior to any possibility to use it as the
default configuration is only Sleep mode. Complete Power Down is entered only after an
explicit command from the Host.
Low power modes
The STA2500D:
– Accepts HCI commands from the Host.
– Supports all types of Bluetooth links.
– Can transfer data over Bluetooth links.
– Dynamically switches between sleep and active mode when needed.
– The system clock is still active in part of the design.
– Parts of the chip are dynamically powered off depending on the Bluetooth activity.
The STA2500D:
– Does not accept HCI commands from the Host.
– Supports Page and Inquiry scans.
– Supports Bluetooth links that are in Sniff or Sniff Subrating.
– Dynamically switches between Deep Sleep and active mode during Bluetooth
– The system clock is not active in any part of the design.
– Parts of the chip are dynamically powered off depending on the Bluetooth activity.
The STA2500D is effectively powered down:
– No Bluetooth activity is supported.
– The HCI interface is shut down.
– The system clock is not active in any part of the design.
– Most parts of the chip are completely powered off.
– RAM content is not maintained (initialisation is required at wake-up).
– Some pins (UART/SPI I/Os and the 4 clock request signals and BT_GPIO_16)
– The Complete Power Down entry is initiated by an HCI command followed by a
activity. The Deep Sleep mode entry is initiated by the Host, the STA2500D
acknowledges or not. The wake-up mechanism must be enabled by a SW
parameter download before it can be used. More details in section 6.10.3.
keep their previous configuration (input or output, pull behaviour) during
Completed Power Down.
Deep Sleep command, this in order to ensure a smooth transition from active to
Complete Power Down state. In order to go out of this mode, either a HW reset or
BT_WAKEUP = ‘1’ is needed.
Doc ID 16067 Rev 1
Description
General specification
Table
24.
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