Harman Kardon AVR 171/230, Service Manual

Page: 112 / 174

Product Specification
Spec-BM840-V1.1 Page 4 of 7 www.sunitec.com.tw
®
Typically connected to VBUS (USB supply) as Section
12 shows.
25 CHG_EXT External battery charger control.
External battery charger transistor base control when
using external charger boost. Otherwise leave
unconnected.
26 VBAT_SENSE Battery charger sense input.
Connect directly to the battery positive pin.
27 VBAT Power IN Battery positive terminal.
28 GND GND Ground
29 1V8_SMPS Power out Serial Peripheral Interface Clock
30 VDD_PADS Power IN Positive supply input for input/output ports
31 PIO9 Bi-directional Programmable Input/Output Line
Alternative functions:
■ UART_CTS: UART clear to send, active low
32 PIO0 Bi-directional Programmable Input/Output Line
Alternative functions:
■ UART_RX: UART data input
33 PIO6 Bi-directional Programmable Input/Output Line
34 PIO18 Bi-directional Programmable Input/Output Line
35 PIO19 Bi-directional Programmable Input/Output Line
36 GND GND Ground
37 USB_N Bi-directional USB data minus
38 USB_P Bi-directional USB data plus with selectable internal 1.5k Ω pull-up
resistor
39 PIO7 Bi-directional Programmable Input/Output Line
40 PIO1 Bi-directional Programmable Input/Output Line
Alternative functions:
■ UART_TX: UART data output
41 PIO8 Bi-directional Programmable Input/Output Line
Alternative functions:
■ UART_RTS: UART request to
send, active low
42 PIO21 Bi-directional Programmable Input/Output Line
43 PIO20 Bi-directional Programmable Input/Output Line
44 LED2 Bi-directional LED driver.
Alternative function: programmable output PIO[31]
45 GND GND Ground
46 MIC_BIAS Analogue out Microphone bias
47 MIC_RN Analogue in Microphone input negative, channel A
48 MIC_RP Analogue in Microphone input positive, channel A
49 MIC_LN Analogue in Microphone input negative, channel B
50 MIC_LP Analogue in Microphone input positive, channel B
51 AGND Analogue Ground connection for audio and audio driver.
52 SPK_RN Analogue out Speaker A output negative, right
53 SPK_RP Analogue out Speaker A output positive, right
54 SPK_LN Analogue out Speaker A output negative, left
55 SPK_LP Analogue out Speaker A output positive, left
56 GND GND Ground
57 RF_IN GND Bluetooth 50 Ω transmitter output /receiver input
58 GND GND Ground
Harman Kardon AVR 171 Service Manual
Page 112 of 174