
WIRELESS CONNECTIVITY & SENSORS
User manual Proteus-II
9. Timing parameters
9.1. Reset and sleep
After power-up, resetting the module or waking the module from sleep a
is
sent to the serial interface as soon as the module is ready for operation.
Description
Typ.
Unit
Ready after reset/sleep
4
ms
9.2. Bluetooth LE timing parameters
The timing parameters for sending advertising packets or scanning are determined by the user
settings
and
. Using these settings,
the advertising interval, the advertising timeout, the scan interval and the scan window can be
configured. Furthermore, the user setting
allows to configure the timing
parameters used during connection setup and connection retention, as well as the connection
interval and the connection supervision timeout.
9.3. Connection establishment
The time needed to establish a connection sums up as the time needed to detect the selected
peripheral on air and the time needed for connection parameter negotiation and service dis-
covery.
1. Peripheral detection To establish a connection, the initiating device (central) waits for an
advertising packet, which was sent by the peripheral to which it wants to connect to. As
soon as such an advertising packet has been received, the central sends a connection
request to the chosen peripheral. The time needed to receive this advertising packet
strongly depends on the advertising interval of the peripheral as well as on the scan
interval and scan window of the central (see
2. Connection parameter negotiation After the connection request has been sent the central
and peripheral negotiate the timing and security parameters of the connection. To finish
this procedure and discover the services of the peripheral several messages have to be
sent, whereby only one is sent per connection interval (see
Order code 2608011x24010
136
Version 1.11 , July 2022