Product Info

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2.6. Power-on and External Reset Characteristics
The DKL 1908_V.1 has built-in power-on reset (POR) circuit which automatically resets all digital registers
when the power is turned on. For stabilization of the complete circuit after the power-on reset, it is highly
recommended to wait at least 3ms before starting the normal operation of the DKL 1908_V.1.
For external hardware reset (warm start), external reset pin RESETn is internally pulled high. The DKL
1908_V.1 will hold in reset state for around 20 us after RESETn is released from the low state.
2.7. Crystal Parameter Specifications
The requirements of the crystal used by the 16 MHz crystal oscillator of DKL 1908_V.1 are listed in the table below.
Table 4. Requirements for 16 MHz Crystal
*Notes: Different crystal vendor have different load capacitance requirement. DKL 1908_V.1 integrates those
two capacitors which are programmable in three values: 16, 20 and 24 pF. If larger capacitor than 24 pF is
needed, the extra capacitors (Figure 17-1 and Figure 17-2) can soldered to the crystal connection pins(PIN12
and PIN13). A bigger capacitor value results a bigger crystal oscillator's stable time. The stable time is the
time from the crystal oscillator is applied the supply voltage to the time which the receiver is able to receive a
packet or the transmitter is able to transmit a packet.
Parameter Min Typ Max Unit
Crystal Frequency 16 MHz
Frequency Error -40 40 ppm
*Integrated Crystal Load Capacitance
REG0x17[7:6]
16 24 pF
*Crystal stable Time 1.6 msec