User's Manual

BT900-Sx Hardware Integration Guide
Intelligent BTv4.0 Dual Mode Module
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19 CONN-HIG-BT900
Other factors that are also related to average current consumption include the
advertising payload bytes in each advertising packet and whether continuously
advertising or periodically advertising.
Connection Interval range -
7.5 ms to 4000 ms in multiples of 1.25 ms.
For a connection event,
- the minimum average current consumption is when the connection interval is large
4000 mS
– the maximum average current consumption is with the shortest connection interval of
7.5 ms; no slave latency.
Other factors that are also related to average current consumption include whether
transmitting 6 packets per connection interval & each packet contains 20 bytes (which
is the maximum for each packet) and an inaccurate 32 kHz master clock accuracy
would increase the average current consumption.
4.2 Measured Peak Current Waveforms During BLE Advertising and Connection
Error! Reference source not found. illustrates current waveforms observed as the BT900 module
performs advertising and connection functionality.
Figure 3: Typical peak current
consumption profile during advertising
in slave mode @ TX PWR +8dBm. UART is
OFF. 8
Figure 4: Typical peak current consumption profile during data
connection event in slave mode @ TX PWR +8dBm. UART is ON.