WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 43

• Manufacturer Part Number: WM8310GEB/V
• Description: POWER MANAGEMENT SUBSYSTEM, 169BGA
• Manufacturer: Wolfson Microelectronics

Specifications of WM8310GEB/V

• Supply Voltage: 7V
• No. Of Step-down Dc - Dc Converters: 4
• No. Of Ldo Regulators: 11
• Digital Ic Case Style: BGA
• No. Of Pins: 169
• No. Of Regulated Outputs: 13
• Operating Temperature Range: -40°C To
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Pre-Production
12.3 4-WIRE (SPI) CONTROL MODE
12.4 REGISTER LOCKING
w
In this mode, the WM8310 registers are accessed using a 4-wire serial control interface. The CS
SCLK1 pins provide the ‘Chip Select’ and ‘Serial Data Clock’ functions respectively. Serial data input
is supported on the SDA1 pin; serial data output is supported on the SDOUT1 pin.
A control word consists of 32 bits. The first bit is the read/write bit (R/W), which is followed by 15
address bits (A14 to A0) that determine which control register is accessed. The remaining 16 bits
(B15 to B0) are data bits, corresponding to the 16 bits in each control register.
In Write operations (R/W=0), all SDA1 bits are driven by the controlling device. Each rising edge of
SCLK1 clocks in one data bit from the SDA1 pin. A rising edge on CS
word consisting of the last 32 bits.
In Read operations, the SDA1 pin is ignored following receipt of the valid register address. The data
bits are output by the WM8310 on the SDOUT1 pin. SDOUT1 is undriven (high impedance) when not
outputting register data bits.
The sequence of signals associated with a register write operation is illustrated in Figure 14.
Figure 14 Control Interface 4-wire (SPI) Register Write
The sequence of signals associated with a register read operation is illustrated in Figure 15.
Figure 15 Control Interface 4-wire (SPI) Register Read
Selected registers are protected by a security key. These registers can only be written to when the
appropriate ‘unlock’ code has been written to the Security Key register.
The protected registers include those associated with Reset Control, OTP Programming, RTC Trim
and Battery Charger operation. Other selected functions also include protected registers; the affected
registers are identified in the Register Map definitions throughout the document, and also in
Section 29.
To unlock the protected registers, a value of 9716h must be written to the Security register (R16392),
as defined in Table 13.
It is recommended to re-lock the protected registers immediately after writing to them. This helps
protect the system against accidental overwriting of register values. To lock the protected registers, a
value of 0000h should be written to the Security register.
SDOUT
SCLK
SDIN
CS
R/W
A14
undriven
A13
15-bit control register address
A12
undriven
A2
A1
A0
B15
X
B14
X
B13
16-bit control register data
X
¯ ¯ latches in a complete control
PP, December 2009, Rev 3.0
B2
X
B1
X
WM8310
B0
X
¯ ¯ and
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