User's Manual

23
RB540HM (
-a/-c)
Interface Signal Definitions
Pin Name Type Description Voltage Range
1
NC
-
-
-
2 KEY No Pin
This Pin has been removed. Add a
key to the mating connector to prevent
the module from being
plugged in backwards.
-
3 PIO2 I
High to shutdown amplifier circuit
to save power consumption
Vih: 0.625 VDD – VDD + 0.3V
Vil: -0.3V - 0.25 VDD
4 PIO3 I
High to put speaker in quiescent
mode
Vih: 0.625 VDD – VDD + 0.3V
Vil: -0.3V -0.25 VDD
5 LINEIN_DET I
High indicates Audio Line thru
JK1 stereo jack. Low is Bluetooth
supported
audio
Vih: 0.625 VDD – VDD + 0.3V
Vil: -0.3V -0.25 VDD
6 VOL+ I High to increase volume
Vih: 0.625 VDD – VDD + 0.3V
Vil: -0.3V -0.25 VDD
7 MUTE I Low to mute system
Vih: 0.625 VDD – VDD + 0.3V
Vil: -0.3V -0.25 VDD
8 CALL_END I High to End Call
Vih: 0.625 VDD – VDD + 0.3V
Vil: -0.3V -0.25 VDD
9 BAT_CHECK I Battery Check
Vih: 0.625 VDD – VDD + 0.3V
Vil: -0.3V -0.25 VDD
10 VOL- I High to decrease volume
Vih: 0.625 VDD – VDD + 0.3V
Vil: -0.3V -0.25 VDD
11 SPI_MOSI I SPI Signal, MOSI
Vih: 0.625 VDD – VDD + 0.3V
Vil: -0.3V -0.25VDD
12 SPI_CLK I SPI Signal, CLK
Vih: 0.625 VDD – VDD + 0.3V
Vil: -0.3V -0.25 VDD
13 SPI_CS I SPI Signal, CS
Vih: 0.625 VDD – VDD + 0.3V
Vil: -0.3V -0.25 VDD
14 SPI_MISO O SPI Signal, MISO
Voh: 0.75VDD – VDD
Vol: 0 – 0.125V
15 PIO8 O Active Low, LED 4
Voh: 0.75VDD – VDD
Vol: 0 – 0.125V
16 PIO4 O Active Low, LED 3
Voh: 0.7 5VDD – VDD
Vol: 0 – 0.125V
17
3V3
P
3
.
3V
VDD: 3
.
1
V
–
3
.
6V
18 GND - Ground
19
VBAT
I
Battery
input
pin
VBAT:
3.3V
–
4.4
V
20 RESET I
Active Low, must be low for at
least 5ms
Vih: 0.625 VDD – VDD + 0.3V
Vil: -0.3V – 0.25 VDD
21 LED1 O
Active Low, Boot up sequence
indicator2
Voh: 0.75 VDD – VDD
Vol: 0 – 0.125V
22 LED0 O
Active Low, Boot up sequence
indicator1
Voh: 0.75 VDD – VDD
Vol: 0 – 0.125V
23 MIC I
Microphone Input, input
impedance 6K Ohm.
4mV rms ~ 800mV rms
24
GND
-
GND
25 SPK_L_P O
Speaker output Left Channel,
Up to 2Vpk-pk differential at a load of 16
ohm. Can drive at least
8 ohm speaker directly.
Full scale swing (Differential):
750 mV rms
26 SPK_L_N O
Speaker output Left Channel,
Up to 2Vpk-pk differential at a load of 16
ohm. Can drive at least
8 ohm speaker directly.
Full scale swing (Differential):
750 mV rms
27 SPK_R_N O
Speaker output Right Channel,
Up to 2Vpk-pk differential at a load of 16
ohm. Can drive at least
8 ohm speaker directly.
Full scale swing (Differential):
750 mV rms
28 SPK_R_P O
Speaker output Right Channel,
Up to 2Vpk-pk differential at a load of 16
ohm. Can drive at least
8 ohm speaker directly.
Full scale swing (Differential):
750 mV rms