Data Sheet

FSC-BT1026 Datasheet
Shenzhen Feasycom Technology Co.,Ltd
www.feasycom.com
-7-
27
PIO20
I/O
Programmable I/O line 20.
Alternative function: PCM_DOUT[1]
Note 5
28
PIO21
I/O
Programmable I/O line 21.
Alternative function: PCM_DOUT[2]
Note 5
29
VCHG_SENSE
Charger input sense pin after external mode sense-resistor.
High impedance.
NOTE: If using internal charger or no charger, connect
VCHG_SENSE direct to VCHG.
30
CHG_EXT
External charger transistor current control. Connect
to base of external charger transistor as per application
schematic.
31
VDD_USB/3.3V_OUT
3.3V voltage output (MAX. 50mA OUT)
Note 7
32
GND
Vss
Power Ground
33
VBAT_IN
Vdd
Battery voltage input.
34
SYS_CTRL
I
Typically connected to an ON/OFF push button.
Boots device in response to a button press when power is still
present from battery and/or charger but software has placed
the device in the OFF or DORMANT state. Additionally useable
as a digital input in normal operation. No pull.
Note 3
35
1.8V_OUT
Vdd
1.8V voltage output
Note 1
36
VDD_IO
I
PIO supply(1.8 V~3.3V)
Note 2
37
USB_DP
USB Full Speed device D+ I/O. IEC-61000-4-2
(device level) ESD Protection
Note 4
38
USB_DN
USB Full Speed device D- I/O. IEC-61000-4-2
(device level) ESD Protection
Note 4
39
VCC_CHG
Vdd
Charger input to Bypass regulator.
Note 4
40
MIC_RP
A
Microphone differential 2 input, positive.
Alternative function:
Differential audio line input right, positive
41
MIC_RN
A
Microphone differential 2 input, negative.
Alternative function:
Differential audio line input right, negative
42
NC
43
MIC_LP
A
Microphone differential 1 input, positive.
Alternative function:
Differential audio line input left, positive
44
MIC_LN
A
Microphone differential 1 input, negative.
Alternative function:
Differential audio line input left, negative
45
MIC_BIAS
Vdd
Mic bias output.
46
AUDIO_HPR_N/ SPK_RN
A
Headphone/speaker differential right output, negative.
Alternative function: Differential right line output, negative
47
AUDIO_HPR_P/ SPK_RP
A
Headphone/speaker differential right output, positive.