Document Number: 002-14826 Rev. *G
Page 2 of 65
PRELIMINARY
CYW43903
General Features
■
Supports battery voltage range from 3.0V to 4.8V with an
internal switching regulator.
■
Programmable dynamic power management.
■
6 Kb OTP memory for storing board parameters.
■
151-ball WLBGA (4.91mm x 5.85mm, 0.4 mm pitch).
Figure 1. Functional Block Diagram
CYW43903
APPS Domain
WLAN
Always-On Domain
UART
DMA
32 KB (I),
32 KB (D)
ICACHE
AXI to AXI
Bridge
Crytography
Engine
APPS ARM
Cortex-R4
1 MB RAM,
640 KB ROM
SPI
PWM (6)
CSC
GPIO (17)
32 kHz
External LPO
PS RAM
PS
SR_Eng
PM
U
Control
PMU
AXI-to-AXI
Bridge
AXI
VIO
REG_ON
HIB_REG_ON_IN
AXI
IEEE 802.11 MAC
1 x 1, IEEE 802.11n PHY
2.4 GHz Radio
LNA
2.4 GHz
AXI-to-AXI
Bridge
WLAN
ARM
Cortex-R4
TCM
512 KB RAM
320 KB ROM
AXI
PA
RF Switch Controls
37.4 MHz Crystal
CSC = Cypress Serial Control. An I
2
C‐compatible interface.
SPI or CSC
TX
Switch
TX
Sw
itc
h
WRF_RFIN_2G
WRF_PAOUT_2G
CSC
PWM
SPI
GPIO
JTAG
VBAT