WM8350GEB/V Wolfson Microelectronics, WM8350GEB/V Datasheet - Page 110

• Manufacturer Part Number: WM8350GEB/V
• Description: Audio CODECs Audio CODEC plus pwr management
• Manufacturer: Wolfson Microelectronics

Specifications of WM8350GEB/V

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8350
w
14.3.3
The WM8350 goes from ACTIVE or HIBERNATE to the OFF state when a shutdown event occurs.
Shutdown events include:
As part of the start-up sequence, the CHIP_ON bit is set to 1. The software shutdown is commanded
by writing 0 to the CHIP_ON register field as described in Table 56.
Table 56 Software Shutdown
As part of the shutdown sequence, the WM8350 asserts the /RST and /MEMRST reset signals,
resets its internal control registers, disables most of its functions, resets the CHIP_ON bit to 0 and
moves to the OFF state. (Note that /MEMRST is an optional output available on GPIO pins only.)
R3 (03h)
System
Control 1
ADDRESS






SHUTDOWN
Software shutdown (setting CHIP_ON = 0)
A trigger signal on a GPIO pin configured as PWR_OFF lasting more than 5ms. The active
polarity of this input is set by GPn_CFG for the applicable GPIO pin (see Section 20).
A trigger signal on the ON pin lasting more than 10 seconds. The active polarity of this
input is set by the register field ON_POL. If required, the de-bounce time can be set to 5
seconds using the ON_DEB_T register bit.
Watchdog time-out (see Section 23) after 7 previous faults.
Fault conditions programmed to trigger a shutdown (see Section 18).
Thermal shutdown (see Section 25)
BIT
15
3
1
CHIP_ON
ON_DEB_T
ON_POL
LABEL
DEFAULT
0
0
1
Indicates whether the system is on or off.
Writing 0 to this bit powers down the whole
chip. Registers which are affected by state
machine reset will get reset.
Once the system is turned OFF it can be
restarted by any of the valid ON event.
ON pin Shutdown function debounce time
0 = 10s
1 = 5s
ON pin polarity:
0 = Active high (ON)
1 = Active low (/ON)
DESCRIPTION
PD, March 2010, Rev 4.2
Production Data
110