AK8186B Datasheet, PDF (38/69 Pages) Asahi Kasei Microsystems – Multi Output Clock Generator with Integrated 2.0GHz VCO

AK8186B
SERIAL CONTROL PORT
The AK8186B has a 3 or 4-wire serial control port which is compatible with both the Motorola SPI^ and Intel
SSR^ protocols. The function of the serial control port is as follows.
- Read/write access to all registers
- Single/Multiple byte access
- MSB/LSB first transfer format
- Data output on SDIO pin (3-wire access: default) or SDO pin (4-wire access)
- Long instruction only (16 bits)
SERIAL CONTROL PORT PIN DESCRIPTIONS
Figure 26. Serial Control Port
Table 32 Serial Control Port Pin Descriptions
Pin No. Pin Name
Descriptions
16 SCLK
17 CS
21 SDO
22 SDIO
Serial Clock Input.
Write data bits are sampled at the rising edge of this clock.
Read data bits are sampled at the falling edge of this clock.
Pulled down by an internal 30k resistor.
Chip Select. An active low input.
When CS=low, read/write access is allowed.
When CS=high, SDIO and SDO become high impedance.
Pulled up by an internal 30k resistor.
Serial Data Output.
Used only in the unidirectional mode (0x00[7]=1,[0]=1).
Serial Data Input/Output.
When 0x00[7]=0,[0]=0, this works in the bidirectional mode.
When 0x00[7]=1,[0]=1, this works in the unidirectional mode.
GENERAL DESCRIPTION OF SERIAL CONTROL PORT
The following section describes the function of the serial control port.
Communication Cycle
Serial communication cycle consists of two parts. The first one is a 16-bit instruction section. The second
one is a data section. Multibyte data can be transferred.
SDIO
16-bit Instruction Word
Data Byte 1
Data Byte 2
Figure 27. Serial Port Communication Cycle
Data Byte n
Sep-2012
- 38 -
draft-E-02