WM8510GEDS/V Wolfson Microelectronics, WM8510GEDS/V Datasheet - Page 57

• Manufacturer Part Number: WM8510GEDS/V
• Description: Audio CODECs VoIP Mono CODEC
• Manufacturer: Wolfson Microelectronics

Specifications of WM8510GEDS/V

• Operating Supply Voltage: - 0.3 V to + 7 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SSOP-28
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
RESETTING THE CHIP
w
Figure 32 3-Wire Serial Control Interface
2-WIRE SERIAL CONTROL MODE
The WM8510 supports software control via a 2-wire serial bus. Many devices can be controlled by
the same bus, and each device has a unique 7-bit device address (this is not the same as the 7-bit
address of each register in the WM8510).
The WM8510 operates as a slave device only. The controller indicates the start of data transfer with
a high to low transition on SDIN while SCLK remains high. This indicates that a device address and
data will follow. All devices on the 2-wire bus respond to the start condition and shift in the next eight
bits on SDIN (7-bit address + Read/Write bit, MSB first). If the device address received matches the
address of the WM8510, then the WM8510 responds by pulling SDIN low on the next clock pulse
(ACK). If the address is not recognised or the R/W bit is ‘1’ when operating in write only mode, the
WM8510 returns to the idle condition and wait for a new start condition and valid address.
During a write, once the WM8510 has acknowledged a correct address, the controller sends the first
byte of control data (B15 to B8, i.e. the WM8510 register address plus the first bit of register data).
The WM8510 then acknowledges the first data byte by pulling SDIN low for one clock pulse. The
controller then sends the second byte of control data (B7 to B0, i.e. the remaining 8 bits of register
data), and the WM8510 acknowledges again by pulling SDIN low.
Transfers are complete when there is a low to high transition on SDIN while SCLK is high. After a
complete sequence the WM8510 returns to the idle state and waits for another start condition. If a
start or stop condition is detected out of sequence at any point during data transfer (i.e. SDIN
changes while SCLK is high), the device jumps to the idle condition.
Figure 33 2-Wire Serial Control Interface
In 2-wire mode the WM8510 has a fixed device address, 0011010.
The WM8510 can be reset by performing a write of any value to the software reset register (address
0 hex). This will cause all register values to be reset to their default values. In addition to this there
is a Power-On Reset (POR) circuit which ensures that the registers are set to default when the
device is powered up.
SCLK
SDIN
START
DEVICE ADDRESS
(7 BITS)
RD / WR
BIT
(LOW)
ACK
register address and
CONTROL BYTE 1
1st register data bit
(BITS 15 TO 8)
(LOW)
ACK
CONTROL BYTE 1
remaining 8 bits of
(BITS 7 TO 0)
register data
PD, Rev 4.5, September 2008
(LOW)
ACK
WM8510
STOP
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