Datasheet

Page 15 of 161
nRF8001 Product Specification
Revision 1.2
5.2 Pin functions
Table 1.nRF8001 pin functions
Pin Pin name Pin function Description
1 VDD Power Power supply (1.9 – 3.6 V)
2 DEC1 Power Regulated power supply output for decoupling purposes only.
Connect 100 nF capacitor to ground
3 DEC2 Power Regulated power supply output for decoupling purposes only.
Connect 33 nF capacitor to ground
4 XL2 Analog output Connect to 32.768 kHz crystal oscillator. If internal RC oscillator
is enabled, this pin shall not be connected.
5 XL1 Analog input Connect to 32.768 kHz crystal oscillator or external 32.768 kHz
clock reference. If internal RC oscillator is enabled, this pin shall
not be connected.
If using a digital clock, this pin must be defined when entering
sleep mode.
6 ACTIVE Digital output Device RF front end activity indicator
7 TXD Digital output UART (transmit) for Bluetooth low energy Direct Test Mode
Interface. Leave unconnected if not in use.
8 VSS Power Ground (0 V)
9 VDD Power Power supply (1.9 – 3.6 V)
10 RXD Digital input UART (receive) for Bluetooth low energy Direct Test Mode
Interface. Leave unconnected if not in use.
11 SCK Digital input ACI clock input. Must be high or low and not floating.
12 REQN Digital input ACI request pin (handshaking, active low).
Must be high or low and not floating.
13 MOSI Digital input ACI Master Out Slave In. Must be high or low and not floating.
14 MISO Digital output ACI Master In Slave Out
15 N/C Digital input Not connected
16 RDYN Digital output ACI device ready indication (handshaking, active low)
17 VSS Power Ground (0 V)
18 VSS Power Ground (0 V)
19 RESET Digital input Reset (active low)
20 VDD_PA Power output Regulated power supply output for on-chip RF Power amplifier
21 ANT1 RF Differential antenna connection (TX and RX)
22 ANT2 RF Differential antenna connection (TX and RX)
23 VSS Power Ground (0 V)
24 AVDD Power Analog power supply (1.9 – 3.6 V DC)
25 IREF Analog output Current reference terminal. Connect a 22 k 1% resistor to
ground
26 AVDD Power Analog power Supply (1.9 – 3.6 V)
27 XC2 Analog output Connection for 16 MHz crystal oscillator. Leave unconnected if
not in use.
28 XC1 Analog input Connection for 16 MHz crystal or external 16 MHz reference
29 AVDD Power Analog power supply (1.9 – 3.6 V DC)
30 VSS Power Ground (0 V)
31 VSS Power Ground (0 V)
32 DCC Power Pulse Width Modulated (PWM) driver for the external LC filter if
the DC/DC converter is enabled. If the DC/DC converter is
disabled this pin shall be not connected.
Exposed
die pad
VSS Power Ground (0 V)