Read Harman Kardon AVR 171 (serv.man3) Service Manual online
Product Specification
Spec-BM840-V1.1 Page 4 of 7 www.sunitec.com.tw
®
Typically connected to VBUS (USB supply) as Section
12 shows.
12 shows.
25
CHG_EXT
External battery charger control.
External battery charger transistor base control when
using external charger boost. Otherwise leave
unconnected.
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.
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
■ UART_CTS: UART clear to send, active low
32 PIO0
Bi-directional Programmable Input/Output Line
Alternative functions:
■ UART_RX: UART data input
■ 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 1.5kΩ pull-up
resistor
resistor
39 PIO7
Bi-directional Programmable Input/Output Line
40 PIO1
Bi-directional Programmable Input/Output Line
Alternative functions:
■ UART_TX: UART data output
■ UART_TX: UART data output
41 PIO8
Bi-directional Programmable Input/Output Line
Alternative functions:
■ UART_RTS: UART request to
send, active low
■ 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
50Ω transmitter output /receiver input
58 GND
GND
Ground
Harman Kardon
AVR 171 Service Manual
Page 112 of 174
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