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CY25823
Document #: 38-07579 Rev. *C
Page 7 of 12
CLKOUT/CLKOUT# Enable Clarification
The CLKOUT enable I2C register bit (Byte1, bit2) is used to
enable/disable the CLKOUT clock. The PLL and crystal oscil-
lator remains on when the outputs are disabled.
When CLKOUT is disabled, the disabled clock is three-stated.
The transition to this mode (three-state) is glitch free. Similarly,
when CLKOUT is enabled the clock starts in a predictable
manner without any glitches or abnormal behavior.
Current Reference, IREF
The details of the current reference circuit are shown in
Figure 3. The operational amplifier in the current reference
circuit drives the gate of MIREF with feedback to establish
VREF = 1.1V at both inputs of the amplifier. Thus the reference
current is established according to the following formula:
IREF = 1.1V / RREF
where RREF is the external resistor and 1.1V is the reference
voltage.
The IREF is scaled by 6x at the output stage and IOUT is given
as: IOUT = 6 x IREF.
The recommended value for RREF is 475 Ohms, which corre-
sponds to the IREF of 2.32mA.
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