AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
8.6 GND, Ground
The GND pin is the ground connection for the digital and analog circuits in the AMIS-52150.
Data Sheet
8.7 CLKOUT, Internal Clock Output
The CLKOUT pin is an output for the RC oscillator, crystal oscillator signal or the recovered data clock. The crystal oscillator signal
output can be divided by 2, 3 or 4. The pin can also be programmed to output the signal from the recovered data clock function. For
more information about the clock and data recovery (CDR) function of the AMIS-52150, refer to the section of this document on clock
and data recovery.
The CLKOUT pin function control registers are shown in Table 13.
Table 13: Oscillator Output Control Registers
CLKOUT Pin Definition Control Registers
Register (HEX)
Name
Bits
0x0c
CLKOUT enable
7
0x0d
CLKOUT select
4,5
0x0e
XTAL divide
0,1
States
0
1
00
01
10
11
00
01
10
11
Comments
CLKOUT is enabled
CLKOUT is disabled
Automatic control
RC OSC
Xtal
Off
Divide by 4
Divide by 3
Divide by 2
Divide by 1
8.8 X1, X2, External Crystal Reference
X1 and X2 pins connect a parallel resonance oscillator crystal to the AMIS-52150 internal oscillator circuit. The external crystal should
meet the requirements as listed in Table 14, however, the two load capacitors should be sized slightly smaller than the recommended
value for the crystal, because the AMIS-52150 adds capacitance in the internal trim circuit. For additional information, see the AMIS
Application Note; “Quick Start Crystal Oscillator Circuit Operation and Setup”. The crystal parameters are shown in Table 14.
Table 14: External Crystal Parameters
Parameter
Min.
Typ.
Max.
Units
Conditions
Crystal Frequency
12.56
12.65
MHz
Targeted
9.375
24.0
Non Quick Start
10.9
14.0
Using Quick Start
Crystal ESR
70
Ω
Crystal Tolerance
10
ppm
Load Capacitance
Load capacitors should be smaller than recommended for
the crystal to allow for frequency tune
8.9 I
2
CDATA, I
2
CCLK, I
2
C Control Interface Bus
The AMIS-52150 implements an I
2
C serial 8 bit bi-directional interface with the pins I
2
CDATA and I
2
CCLK. The AMIS-52150
implements the protocol for a slave device. The clock for the interface is generated by the external master device. The interface will
support the normal (0 – 100 Kbits/second) or the fast (0 – 400Kbits/second) data modes. The interface conforms to the Phillips
2
specification for the I C bus standard. The pins have internal pull up resistors. See Table 15 and Table 16 for some parameters of this
interface.
2
C address increment function.
AMI Semiconductor
– Rev 4.0, Oct. 06 – M-20535-004
www.amis.com
9
ONSEMI [ ON SEMICONDUCTOR ]
