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12
SWRS158B – FEBRUARY 2015 – REVISED JULY 2016
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Terminal Configuration and Functions
Copyright © 2015–2016, Texas Instruments Incorporated
Table 4-3. Signal Descriptions – RSM Package (continued)
NAME
NO.
TYPE
DESCRIPTION
(3)
If internal DC-DC is not used, this pin is supplied internally from the main LDO.
(4)
If internal DC-DC is not used, this pin must be connected to VDDR for supply from the main LDO.
RX_TX
4
RF I/O
Optional bias pin for the RF LNA
VDDR
28
Power
1.7-V to 1.95-V supply, typically connect to output of internal DC-DC.
(2) (3)
VDDR_RF
32
Power
1.7-V to 1.95-V supply, typically connect to output of internal DC-DC
(2) (4)
VDDS
27
Power
1.8-V to 3.8-V main chip supply
(1)
VDDS2
11
Power
1.8-V to 3.8-V GPIO supply
(1)
VDDS_DCDC
19
Power
1.8-V to 3.8-V DC-DC supply. Tie to ground for external regulator mode
(1.7-V to 1.95-V operation).
VSS
3, 7, 17, 20,
29
Power
Ground
X32K_Q1
5
Analog I/O
32-kHz crystal oscillator pin 1
X32K_Q2
6
Analog I/O
32-kHz crystal oscillator pin 2
X24M_N
30
Analog I/O
24-MHz crystal oscillator pin 1
X24M_P
31
Analog I/O
24-MHz crystal oscillator pin 2
EGP
Power
Ground – Exposed Ground Pad