AS3658 Power Management IC

Description

The AS3658 is highly integrated power and audio management unit. It includes all the features from the AS3654 and adds on top an 16-bit Audio ADC, a second headphone amplifier, a microphone bias with amplifier, a RTC with alarm and time function, an unique ID block and three more LDOs.

Key Features

System Control

• Serial Control Interface
• On/Off Control Module with Boot-ROM / GPIO
• Reset Generation for system controller
• Programmable Interrupt Controller and Watchdog
• Low power off mode (9mA; 2.5V LDO on)
• 88-bit unique ID or Boot fuse array
• Reset with long ON-Keypress (5s, SW-Interuptable)
• Touchscreen Interface (10-bit, interrupt)

Supply Voltage Generation

• 2 RF Programmable Low Noise LDOs (250mA)
  (1 LDO can be a current controlled switch for hotplug [200mA ±40%])
• 1 RF Programmable Low Noise LDO (400mA)
• 4 Programmable Dig. Low Power LDOs (200mA)
• 2 General Purpose PWM DC/DC step up converter with three programmable current sinks (e.g. for white led); for current mode feedback is automatically slected (DCDC_CURR1,2,3)
• 3 General Purpose high efficiency DC/DC step down converter (DCDC 1 support DVM)
• 1 Low noise charge pump with 5V output voltage
• 1 Ultra Low Power 2.5V LDO (always on)

Current Sinks

• 4 programmable(8-bit) from 0.15mA to 38.25mA (+/-5% ) optional useable as GPIOs
• 3 programmable high voltage (15V) (8-bit) from 0.15mA to 38.25mA (±5%)
• Internal PWM generator (extended time range)
  (can control DCDC_CURR1,2,3)

10-bit 40ms Successive Approximation ADC

• Two external Inputs (ADC_IN1, ADC_IN2)

Battery Management

• Full featured chemistry independent step down charger with Gas Gauge and Current limitation
• High Current (1.0A) Linear Charger with external pass transistor (no SD charger)
• 0.1W Battery switch for start-up and trickle charge
• Integrated USB charger up to 880mA (can be used as wall adapter charger); current accuracy 440-500mA for USB specification, in-circuit trimmable (±1.2% trimsteps)
• Autonomous Battery Temperature Supervision (0°C-45°C or 0°C- 50°C) for 10k and 100k NTC
• Charging Timeout (1h-8h in 30min steps)
• Charging in Stanby mode
• Completely Autonomous (no SW)

Power Management Features

• Wide Battery Supply Range 3.0…5.5V
• High Accuracy Reference (±1%)
• Thermal and Current Protection (int. sensor)
• Standby Mode exit by interrupt e.g.Onkey/RTC

Audio

• 94dB Audio DAC, 16-48kHz sampling rate
• Two Digital Audio Inputs (2 x I²S interface)
• 2.9V low Noise LDO for Audio DAC
• Two Headphone Amplifier Output with GND separation
• Two I2S Inputs and one I²S Output
• I²S master mode with programmable sample rate (controlled by internal PLL)
• GND Buffer for Headphone Amplifier
• Line/ Headphone outputs with GND separation
• Audio ADC, 82dB SNR with 16ksps
• Mono Microphone Supply and Amplifier
• 5 Band Adjustable Audio Equalizer (±12dB in 3dB gain steps)
• SPDIF Output
• Audio Mixer and Gain Stages
• PCM Interface

Real Time Clock (RTC)

• Alarm and Time function
• Repeated Wakeup (every second or minute)
• 32kHz output
• Backup Battery Charger and Switchover

Programmable System Clock

• 1.6 MHz to 2.3 MHz with 100 kHz steps

Package

• BGA124 8x8mm, 0.5mm pitch (can be assembled without microvia boards)

Applications

• PDA, PMP, GPS-Navigation System
• 1 Cell Li+ or 3 Cell NiMH powered devices

Block diagram for AS3658 Power Management IC