RAYTAC MDBT42Q - AT, Manual

Page: 12 / 68

12
2.4. Pin Assignment
Pin No. Name Pin Function Description
(1) GND Ground The pad must be connected to a solid ground plane
(2) NC No function Not connected
(3) NC No function Not connected
(4) NC No function Not connected
(5) NC No function Not connected
(6) NC No function Not connected
(7) NC No function Not connected
(8) NC No function Not connected
(9) DEC4 Power
1V3 regulator supply decoupling. Input from DC/DC
converter. Output from 1V3 LDO .
(10) DCC Power DC/DC converter output pin
(11) VDD Power Power-supply pin
(12) GND Ground The pad must be connected to a solid ground plane
(13)
NC No function Not connected when using internal RC (LFXO)
XL1 Analog input
Connecting to 32.768KHz crystal when using external
LFXO
(14)
NC No function Not connected when using internal RC (LFXO)
XL2 Analog input
Connecting to 32.768KHz crystal when using external
LFXO
(15) ADC Analog input 10bit resolution ADC is always on and update every 200ms
(16)
Indicator
Output / Logic Output logic is selective about the action of BT connection
(17)
Connecting
or Adver. LED
Output Setting of LED pattern is changeable when it is active-low
(18) UART RTS Output RTS, request to send
(19) UART TX Output UART transmitter
(20) UART CTS Input CTS, clear to send
(21) UART RX Input UART receiver