WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 54

• 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

WM8310
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14.3.2
Development mode is selected if a logic high level (referenced to the LDO12 VPMIC voltage) is
present on SCLK2. This should be implemented using a pull-up resistor. See Section 14.3.4 for
details of the External DBE Memory connection.
If development mode is selected, then the WM8310 performs a check for valid DBE data; if the DBE
is not connected or contains invalid data, then the WM8310 remains in the OFF power state. The
DBE data is deemed valid is the DBE_VALID_DATA field contains the value A596h.
The WM8310 also performs a check for valid contents in the OTP_CUST_ID field in development
mode; if the OTP_CUST_ID field is set to zero, then the WM8310 remains in the OFF power state. A
non-zero OTP_CUST_ID field is used to confirm valid DBE contents.
14.3.3
Under default settings, the bootstrap configuration data is always loaded when an ON transition is
scheduled. For development purposes, this can be disabled by clearing the RECONFIG_AT_ON
register bit. (Note that RECONFIG_AT_ON only selects whether Page 2/3/4 data is loaded; Page 0/1
data is always loaded from OTP whenever an ON transition is scheduled.)
When RECONFIG_AT_ON = 1, the bootstrap data is reloaded from either the DBE or OTP when an
ON transition is scheduled. The logic level on SCLK2 is checked to determine whether the DBE or
the OTP memory should be used. If RECONFIG_AT_ON = 0, then the latest contents of the DORW
are used to configure the start-up sequence.
Note that, when WM8310 start-up is scheduled using this method, the contents of OTP_CUST_ID is
still checked for valid contents. In development mode, the DBE_VALID_DATA field is also checked.
See Section 14.3.2 for details.
Note that the RECONFIG_AT_ON control register is locked by the WM8310 User Key. This register
can only be changed by writing the appropriate code to the Security register, as described in
Section 12.4.
R16390 (4006h)
Reset Control
Table 22 Bootstrap Configuration Reload Control
14.3.4
The recommended component for the external DBE is the Microchip 24AA32A, which provides 32
bytes of memory space. The DBE interfaces with the WM8310 via the SCLK2 and SDA2 pins, and
initiates an I2C transfer of data from the DBE when required. The necessary electrical connections
for this device are illustrated in Figure 19. The WM8310 assumes an EEPROM device ID of
1010 0001 (A1h) for DBE read cycles.
The DBE memory contents are defined similarly to Pages 2, 3 and 4 of the DORW memory contents
defined in Section 14.6.
ADDRESS
START-UP FROM DBE MEMORY (DEVELOPMENT MODE)
START-UP FROM DORW REGISTER SETTINGS
EXTERNAL DBE MEMORY CONNECTION
BIT
15
RECONFIG_A
T_ON
LABEL
DEFAULT
1
Selects if the bootstrap configuration
data should be reloaded when an ON
transition is scheduled
0 = Disabled
1 = Enabled
Protected by user key
PP, December 2009, Rev 3.0
DESCRIPTION
Pre-Production
54