sta2416 STMicroelectronics, sta2416 Datasheet - Page 22

• Manufacturer Part Number: sta2416
• Description: Bluetooth?? Baseband With Integrated Flash
• Manufacturer: STMicroelectronics

General specification
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General specification
System clock
The STA2416 works with a single 13 MHz clock provided on pin XIN. For proper Bluetooth
wireless operation this clock must have a tolerance of ±20 ppm or better.
Slow clock
The slow clock is used by the baseband as reference clock during the low-power modes.
The slow clock requires an accuracy of ±250 ppm (overall).
Several options are foreseen in order to adjust the STA2416 behavior according to the
features of the radio used.
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Boot procedure
The boot code instructions are the first that ARM7TDMI
All the internal device registers are set to their default value.
There are two types of boot:
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In order to reliably download code the STA2416 must run with a system clock of 13 MHz. At
other frequencies the download may fail.
Clock detection
The STA2416 has an automatic slow-clock frequency detection (32kHz, 3.2kHz or none).
If the system clock is not provided at all times (power consumption saving) and no slow
clock is provided by the system, a 32 kHz crystal must be used by the STA2416 (default
mode).
If the system clock is not provided at all times (power consumption saving) and the
system provides a slow clock at 32 kHz or 3.2 kHz, this signal is simply connected to
the STA2416 (LPO_CLK_P).
If the system clock is provided at all times, the STA2416 generates from the reference
clock an internal 32 kHz clock. This mode is not an optimized mode for power
consumption.
Flash memory boot
When boot pin is set to ‘1’ (connected to VDD), the STA2416 boots on its Flash.
UART download boot from ROM
When boot pin is set to ‘0’ (connected to GND), the STA2416 boots on its internal ROM
(needed to download the new firmware in the Flash memory). When booting on the
internal ROM, the STA2416 will monitor the UART interface for approximately 1.4
second. If there is no request for code downloading during this period, the ROM jumps
to Flash.
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executes after a hardware reset.
STA2416
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