W532
Document #: 38-07253 Rev. *A
Page 2 of 8
Pin Definitions
Pin Name
Pin No.
Pin
Type
Pin Description
SSOUT
12
O
Output Modulated Frequency: Frequency modulated signal. Frequency of
the output is selected as shown in Table 1.
CLKIN or X1
1
I
Crystal Connection or External Reference Frequency Input: This pin has
dual functions. It may either be connected to an external crystal, or to an
external reference clock.
NC or X2
2
I
Crystal Connection: Input connection for an external crystal. If using an ex-
ternal reference signal, this pin must be left unconnected.
SSON#
8
I
Spread Spectrum Control (Active LOW): Asserting this signal (active LOW)
turns the internal modulation waveform on. This pin has an internal pull-down
resistor.
MW
9
I
Modulation Width Selection: When Spread Spectrum feature is turned on,
these pins are used to select the amount of variation and peak EMI reduction
that is desired on the output signal (see Table 2).
IR1:2
14, 13
I
Reference Frequency Selector: Logic level provided at this input indicates
to the internal logic what range the reference frequency is in and determines
the factor by which the device multiplies the input frequency. Refer to Table 3.
These pins have internal pull-up resistors.
OR1:2
4, 7
I
Output Frequency Selection Bits: These pins select the frequency of oper-
ation for the output. Refer to Table 1. OR1: DOWN - OR2: UP.
VDD
3, 10, 16
P
Power Connection: Connected to 3.3V or 5V power supply.
GND
6, 11, 15
G
Ground Connection: Connect all ground pins to the common ground plane.
NC
5
NC
No Connect: Leave this pin floating.
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