W7020 Datasheet, PDF (24/36 Pages) List of Unclassifed Manufacturers – Bluetooth Radio Module

W7020 Bluetooth Radio Module
Preliminary Data Sheet
September 2000
Transmit and Receiver Information (continued)
Timing Information (continued)
Table 19. Timing Table
Symbol
TTX
TTX
TTX
TRX
TRX
TRX
tPHD
tRD
tRO
tS
tS
tS
tTD
tTO
Parameter
Data Sending Period, 1-slot Packet
Data Sending Period, 3-slot Packet
Data Sending Period, 5-slot Packet
Data Receiving Period, 1-slot Packet
Data Receiving Period, 3-slot Packet
Data Receiving Period, 5-slot Packet
Phase Detector Off Delay after tTO
Delay Before Receiving Data
Receiver On Delay
Slot Time, 1-slot Packet
Slot Time, 3-slot Packet
Slot Time, 5-slot Packet
Delay Before Transmitting Data
Transmitter On Delay
Min Typ Max Unit
— — 366 µs
— — 1622 µs
— — 2870 µs
— — 366 µs
— — 1622 µs
— — 2870 µs
— 104 —
µs
— 213 —
µs
— 208 —
µs
— 625 —
µs
— 1875 —
µs
— 3125 —
µs
— 214 —
µs
— 110 —
µs
Power-On Reset and XO Start-Up
The power-on reset is a block that creates a reset signal to the digital circuitry. The transition from low to high on
the POR signal occurs when the LPO and the crystal oscillator, XO, are running and the POR_EXT signal is high.
(See Table 20.) Both POR_EXT and POR are active-low signals.
Table 20. Reset Truth Table
POR_EXT
(pin 9)
0
1
1
1
XO
X
X
No osc.
Osc.
LPO
X
No osc.
Osc.
Osc.
POR
(pin 30)
0
0
0
1
A power supply drop below a certain voltage level that is caused by, for example, a glitch, will automatically
cause a reset.
A 13 MHz crystal should be connected to the XO_N and XO_P pins, as shown in Figure 3. An internal
(0 pF—8 pF) capacitive load of the crystal can be adjusted with the XO-trim register so that the crystal runs at
13 MHz within ±20 ppm. Alternatively, an external 13 MHz sinus signal (200 mV—500 mV peak) can be used
instead of the external crystal. The clock should be ac-coupled into the XO_N pin.
Figure 10 and Figure 11 show typical powerup initialization and wake-up sequences.
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Lucent Technologies Inc.