WM8351CGEB/RV WOLFSON [Wolfson Microelectronics plc], WM8351CGEB/RV Datasheet - Page 112
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WM8351CGEB/RV
Manufacturer Part Number
WM8351CGEB/RV
Description
Manufacturer
WOLFSON [Wolfson Microelectronics plc]
Datasheet
1.WM8351CGEBRV.pdf
(330 pages)
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WM8351
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Table 62 Control Interface Switching in Development Mode
In Development mode, the GPIO1 pin is configured as a DO_CONF output (see Section 20), which is
asserted high to indicate that the WM8351 is about to start up. This may be used to trigger the ‘genie’
to configure the WM8351 via the secondary control interface.
Figure 65 Configuration Timing in Development Mode
On completion of the register configuration, the power-up sequence is initiated by writing a logic 1 to
the CONFIG_DONE bit. If the CONFIG_DONE bit is not set before the maximum set-up time has
elapsed (see Figure 65), then the WM8351 will revert to the OFF state.
An alternative implementation is to start up the WM8351 by setting CONFIG_DONE to ‘1’ without first
programming the converter/LDO settings. By this method, the rising edge of the /RST signal may be
used to trigger the WM8351 configuration process after the device has entered the ACTIVE state. In
this case, the DC-DC converters and LDOs turn on immediately when they are enabled (time slots are
no longer relevant because the WM8351 is already in the ACTIVE state). To reduce in-rush current,
any configuration sequence triggered by /RST should therefore include supply staggering in software
(i.e. time delays between powering up individual supply domains).
Note that, whether using DO_CONF or /RST to trigger configuration, the on-chip watchdog imposes a
time-out for configuration; if the WM8351 watchdog is not serviced, it restarts the system. This can be
prevented, if necessary, by disabling the watchdog.
14.4.2
R6 (06h)
Interface
Control
Note: In custom modes (CONF[1:0]≠00), the secondary control interface is never used and the
control bits described here have no effect.
ADDRESS
STARTING UP IN DEVELOPMENT MODE
14:13
BIT
15
USE_DEV_
PINS
DEV_ADDR
[1:0]
LABEL
DEFAULT
00
1
Selects which pins to use for the 2-wire
control:
0 = Use 2-wire I/F pins as 2-wire interface
1 = Use GPIO 10 and 11 as 2-wire interface,
e.g. to download settings from PIC.
Only applies when CONFIG pins[1:0] = 00.
Selects device address (only valid when
CONF_STS = 00)
00 = 0x34
01 = 0x36
10 = 0x3C
11 = 0x3E
DESCRIPTION
PD, April 2012, Rev 4.5
Production Data
112
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