Product Info

LM746 Bluetooth® Dual Mode Audio Module
Standalone (With Embedded Bluetooth® 5 Compliant Stack)
Pin Assignments Continued
Pin
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
Name
LED1
LED2
PIO0
PIO1
PIO2
PIO3
PIO4
PIO5
PIO6
PIO7
USB_DP
USB_DN
PIO_POWER
GND
1V8_SMPS
VBAT
VBAT_SENSE
VCHG
CHG_EXT
VREG_ENABLE
UART_CTS
UART_RTS
MIC_LN
MIC_LP
MIC_BIAS_A
MIC_RN
MIC_RP
MIC_BIAS_B
SPKR_RN
SPKR_RP
SPKR_LN
SPKR_LP
GND
Type
Open drain output
Open drain output
Bi-directional with weak pull-down
Bi-directional with weak pull-down
Bi-directional with weak pull-down
Bi-directional with weak pull-down
Bi-directional with weak pull-down
Bi-directional with weak pull-down
Bi-directional with weak pull-down
Bi-directional with weak pull-down
Bi-directional
Bi-directional
VDD
Ground
VDD
Battery terminal +ve
Charger input
Analogue
Bi-directional weak pull-down
Bi-directional weak pull-up
Analogue
Analogue
Analogue
Analogue
Analogue
Analogue
Analogue
Analogue
Analogue
Analogue
Ground
Description
LED Driver
LED Driver
Programmable input / output line
Programmable input / output line
Programmable input / output line
Programmable input / output line
Programmable input / output line
Programmable input / output line
Programmable input / output line
Programmable input / output line
USB data +
USB data -
Positive supply for PIO
Common Ground
1V8 Output
Lithium ion/polymer battery positive terminal.
Battery charger output and input to switch mode
regulator.
Battery charger sense input
Lithium ion/polymer battery charger input
External charger control
Otherwise leave unconnected
Regulator enable input
UART clear to send, active low.
UART request to send, active low. Alt PIO16.
Microphone input negative, left.
Microphone input positive, left.
Microphone bias A
Microphone input negative, right
Microphone input positive, right
Microphone bias B
Speaker output negative, right
Speaker output positive, right
Speaker output negative, left
Speaker output positive, left
Common Ground
Supply Domain
PIO_POWER
PIO_POWER
PIO_POWER
PIO_POWER
PIO_POWER
PIO_POWER
PIO_POWER
PIO_POWER
PIO_POWER
PIO_POWER
3V3_USB
3V3_USB
0V
PIO_POWER
PIO_POWER
VDD_AUDIO (1.35V)
VDD_AUDIO (1.35V)
VBAT/3V3_USB
VDD_AUDIO (1.35V)
VDD_AUDIO (1.35V)
VBAT/3V3_USB
VDD_AUDIO_DRV (1V8_SMPS)
VDD_AUDIO_DRV (1V8_SMPS)
VDD_AUDIO_DRV (1V8_SMPS)
VDD_AUDIO_DRV (1V8_SMPS)
0V
Part No
Product
See Last Page
LM746
LM746
Page 4 of 21
[phone] | [e-mail]
4
6
MIC_LP Analogu
e
M
icrophone input positive, left
.
VDD_AUDIO (1.35V
)
4
8
MI
C
_RN
A
na
l
ogu
e
M
icrop
h
one input negative, rig
h
t
VDD_AUDIO (1.35V
)