Rainbow Electronics MAX3107 - Manual (Page 12)

12 _____________________________________________________________________________________
MAX3107
SPI/I
2
C UART with 128-Word FIFOs
and Internal Oscillator
Pin Configurations
Pin Descriptions
TQFN
(3.5mm × 3.5mm)
MAX3107
19
20
21
22
1 2 3 4 5 6
18 17 16 15 14 13
23
24
12
11
10
9
8
7
TX
XOUT
V EXT
XIN
V A +
V
18
I2C/SPI LDOEN
DOUT/SDA SCLK/SCL
CS/A0
RX GPIO3 GPIO2 GPIO1
AGND
*EP
*CONNECT EP TO AGND.
GPIO0
V
L
DGND
RST
DIN/A1
IRQ
CTS
TOP VIEW
24
23
22
21
20
19
17
1
2
3
4
5
6
8
XOUT
V EXT
TX
RX V 18
V A
AGND
XIN
MAX3107
CTS
GPIO2 SCLK/SCL
LDOEN
18 7 GPIO3 DOUT/SDA
15 10 GPIO0 DIN/A1
16 9 GPIO1 CS/A0
13 12 V L RST
14 11 DGND IRQ
I2C/SPI
SSOP
+
RTS/CLKOUT
RTS/CLKOUT
PIN
NAME FUNCTION
TQFN-EP SSOP
1 4 V 18
Internal 1.8V LDO Output and 1.8V Logic Supply Input. Bypass V 18 with a 0.1FF
ceramic capacitor to AGND.
2 5 I2C/SPI
SPI or Active-Low I 2 C Selector Input. Drive I2C/SPI high to enable SPI. Drive I2C/SPI
low to enable I 2 C.
3 6 LDOEN
LDO Enable Input. Drive LDOEN high to enable the internal 1.8V LDO. Drive LDOEN
low to disable the internal LDO. When LDO is low, V
18 can be supplied by an exter-
nal voltage source.
4 7 DOUT/SDA
Serial-Data Output. When I2C/SPI is high, DOUT/SDA functions as the DOUT SPI
serial-data output. When I2C/SPI is low, DOUT/SDA functions as the SDA I
2 C serial-
data input/output.
5 8 SCLK/SCL
Serial-Clock Input. When I2C/SPI is high, SCLK/SCL functions as the SCLK SPI
serial-clock input (up to 26MHz). When I2C/SPI is low, SCLK/SCL functions as the
SCL I
2 C serial-clock input (up to 400kHz).
6 9 CS/A0
Active-Low Chip-Select and Address 0 Input. When I2C/SPI is high, CS/A0 functions
as the CS SPI active-low chip select. When I2C/SPI is low, CS/A0 functions as the
A0 I
2 C device address programming input. Connect CS/A0 to DGND or V L .