CC256X_13 Datasheet, PDF (9/51 Pages) Texas Instruments – Bluetooth and Dual-Mode Controller

CC256x
www.ti.com
SWRS121C – JULY 2012 – REVISED OCTOBER 2013
3.2 Terminal Functions
Table 3-1 describes the terminal functions.
Name
No.
I/O Signals
HCI_RX
A26
HCI_TX
A33
HCI_RTS
A32
HCI_CTS
A29
AUD_FSYNC
A35
AUD_CLK
B32
AUD_IN
B34
AUD_OUT
B33
TX_DBG
B24
Clock Signals
SLOW_CLK
A25
XTALP/FREFP
B4
XTALM/FREFM
A4
Analog Signals
BT_RF
B8
nSHUTD
A6
Power and Ground Signals
VDD_IO
A17,
A34,
A38,
B18,
B19,
B21,
B22,
B25
MLDO_IN
B5
MLDO_OUT
A5, A9,
B2, B7
CL1.5_LDO_IN
B6
CL1.5_LDO_OUT
DIG_LDO_OUT
SRAM_LDO_OUT
DCO_LDO_OUT
A7
A2, A3,
B15,
B26,
B27,
B35,
B36
B1
A12
Table 3-1. Device Pad Descriptions
Pull
at
Reset
Def.
Dir. ⁽¹⁾
I/O
Type ⁽²⁾
Description
PU
I
8 mA
HCI universal asynchronous receiver/transmitter (UART) data
receive
PU
O
8 mA HCI UART data transmit
PU
O
8 mA
HCI UART request-to-send
The host is allowed to send data when HCI_RTS is low.
HCI UART clear-to-send
PU
I
8 mA The CC256x device is allowed to send data when HCI_CTS is
low.
PD
I/O
4 mA pulse-code modulation (PCM) frame-sync signal Fail-safe
PD
I/O HY, 4 mA PCM clock
Fail-safe
PD
I
4 mA PCM data input
Fail-safe
PD
O
4 mA PCM data output
Fail-safe
PU
O
2 mA
TI internal debug messages. TI recommends
leaving an internal test point.
I
32.768-kHz clock in
Fail-safe
I
Fast clock in analog (sine wave)
Output terminal of fast-clock crystal
Fail-safe
I
Fast clock in digital (square wave)
Input terminal of fast-clock crystal
Fail-safe
I/O
PD
I
Bluetooth RF I/O
Shutdown input (active low)
I
I/O power supply (1.8-V nominal)
I
Main LDO input
Connect directly to battery
I/O
Main LDO output (1.8-V nominal)
I
Power amplifier (PA) LDO input
Connect directly to battery
O
PA LDO output
Digital LDO output
O
QFN pin B26 or B27 must be shorted to other
DIG_LDO_OUT pins on the PCB.
O
SRAM LDO output
O
DCO LDO output
(1) I = input; O = output; I/O = bidirectional
(2) I/O Type: Digital I/O cells. HY = input hysteresis, current = typical output current
Copyright © 2012–2013, Texas Instruments Incorporated
Submit Documentation Feedback
Detailed Description
9