wm8350 Wolfson Microelectronics plc, wm8350 Datasheet - Page 2

• Manufacturer Part Number: wm8350
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

WM8350
TYPICAL APPLICATIONS
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The WM8350 is a complete audio and power management solution for portable media devices. The
device incorporates four programmable step-down switching regulators, two step-up switching
regulators, a full-featured battery charger, four Low Drop-Out (LDO) voltage regulators which can also
serve as hot-swap outputs, a backup supply regulator, two programmable white LED drivers, a Real-
Time Clock (RTC) alongside a 32.768kHz (32kHz) oscillator capable of operating from a backup
battery, a 12-bit auxiliary ADC for precise measurements, a ROM-programmable power management
state machine and numerous protection features all in a single 7x7mm BGA package. When only
battery power is available, a battery switch provides power to all switching regulators (and some other
internal modules). When external power is applied (eg. from USB or Wall adapter), the WM8350
seamlessly transitions from battery power (a single-cell Lithium battery) to the applicable external
supply. The battery charger is then activated, all internal power for the device is drawn from the
appropriate external power source and the battery is disconnected from the load. Maximum battery
charge current and charge time are programmable. The USB power manager provides accurate
current limiting for the USB pin under all conditions. The hot-swap outputs (LDOs in current-limited
‘Switch Mode’ operation) are ideal for powering memory cards and other devices that can be inserted
while the system is fully powered.
The integrated Hi-Fi stereo CODEC incorporates preamps and a low-noise bias voltage for differential
microphones, and flexible pseudo-differential drivers for headphone and differential/single-ended line
outputs. External component requirements are reduced as no separate microphone or headphone
amplifiers are required. Digital filter options are available in the ADC and DAC paths, to cater for
application filtering. The WM8350 is capable of operating without any external clock, as it can derive
all required clocks from its internal crystal oscillator, RC clock, and Frequency Locked Loop. An
external low jitter clock may be required in some applications for high performance audio.
PD, June 2009, Rev 4.1
Production Data
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