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CS35L32 Datasheet(PDF) 6 Page - Cirrus Logic |
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CS35L32 Datasheet(HTML) 6 Page - Cirrus Logic |
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6 / 51 page  6 DS963F5 CS35L32 1 Pin Descriptions RESET B3 VA I Reset. When asserted, the device enters a low-power mode, outputs are set to Hi-Z, and I²C register values are set to defaults. Outputs are Hi-Z except those with weak pull-ups or pull-downs as mentioned. — — Hysteresis on CMOS input Low FLEN D4 VA I Flash Enable. Input signal commanding a flash event into both LEDs. It is asserted high. Weak pull- down (~1 M — Hysteresis on CMOS input Pulled down FLINH C4 VA I Flash Inhibit. Input signal determining whether the LEDs are in Flash Mode (logic low) or Flash-Inhibit Mode (logic high, LED current reduced). Weak pull- down (~1 M — Hysteresis on CMOS input Pulled down FLOUT1 B6 SPKR SUPPLY O LED Driver 1. Output driving LED 1 by sinking current from the LED cathode Weak pull-up (~1 M — — SPKR SUPPLY FLOUT2/AD0 A6 SPKR SUPPLY I/O LED Driver 2/Address Zero. Output driving LED 2 by sinking current from the LED cathode. AD0 programs the chip address when RESET is deasserted. If no LED is used, tying the pin to ground clears the chip address LSB. Otherwise, the LSB is set. Weak pull-up (~1 M — — SPKR SUPPLY VBST E1 — O Boost Converter Output. Output of boosted supply. This pin cannot be used to drive any external loads other than the on chip Class D Amplifier and Flash LEDs. —— — — SPKRSUPPLY E2 — I Speaker Supply. Full-bridge Class D speaker amplifier power supply. —— SW C1, D1 VBST I Boost Converter Switch Node. Connects the inductor to the rectifying switch. —— — — IREF+ D5 VA I Current Reference Resistor. Connection for an external resistor to be used for generating the CS35L32’s internal main current reference. See Fig. 2-1 for required resistor value. —— — — IN+ E4 SPKR SUPPLY I Input 1 Differential Positive Line. Positive analog input —— — — IN– E3 SPKR SUPPLY I Input 1 Differential Negative Line. Negative analog input —— — — SPKOUT+ SPKOUT–/VSENSE– D2 D3 SPKR SUPPLY O Speaker Differential Audio Output. Internal Class D speaker amplifier output. SPKOUT– serves as voltage monitor negative sense pin (VSENSE–). —— — Hi-Z ISENSE+ ISENSE–/VSENSE+ E6 E5 SPKR SUPPLY I Current Sense Inputs. Sense voltage across an external resistor in series with SPKOUT+. ISENSE– serves as voltage monitor positive sense pin (VSENSE+). —— — — FILT+ D6 VA O Positive Voltage Reference. Positive reference for internal circuits —— — — VA C6 — I Analog Input Power. Power supply for internal analog section —— — — VP B1 — I Boost Converter Input Power. Power supply or battery voltage powering boost converter —— — — GNDA C5 — Analog Ground. Ground reference for the internal analog section of the IC —— — — GNDP C2, C3 — Power Ground. Ground reference for boost converter and Class D amplifier’s output stage —— — — GNDPLED B5 — LED Power Ground. Ground reference for LED current return. Should be tied to ground plane. —— — — Table 1-1. Pin Descriptions (Cont.) Ball Name Ball Number Power Supply I/O Ball Description Internal Connection Driver Receiver State at Reset LED Boost Converter Audio Power Supply General Ground |
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