SI5344H-42H Datasheet, PDF (45/56 Pages) Silicon Laboratories – HIGH-FREQUENCY,

Si5344H/42H
Table 19. Pin Descriptions Table
Pin Name
Si5342H Si5344H
Pin
Pin _{Pin Type}¹
Number Number
Function
Serial Interface
I2C_SEL
38
38
I
I²C Select
This pin selects the serial interface mode as I²C
(I2C_SEL = 1) or SPI (I2C_SEL = 0). This pin is internally
pulled high. Leave disconnected when unused. See Note
2_.
SDA/SDIO
13
13
I/O Serial Data Interface
This is the bidirectional data pin (SDA) for the I²C mode,
or the bidirectional data pin (SDIO) in the 3-wire SPI
mode, or the input data pin (SDI) in 4-wire SPI mode.
When in I²C mode, this pin must be pulled-up using an
external resistor of at least 1 k. No pull-up resistor is
needed when is SPI mode. Tie low when unused. See
Note ².
A1/SDO
15
15
I/O Address Select 1/Serial Data Output
In I²C mode this pin functions as the A1 address input pin.
In 4-wire SPI mode this is the serial data output (SDO)
pin. Leave disconnected when unused. See Note ².
SCLK
14
14
I
Serial Clock Input
This pin functions as the serial clock input for both I²C and
SPI modes. When in I²C mode, this pin must be pulled-up
using an external resistor of at least 1 k. No pull-up
resistor is needed when in SPI mode. Tie high or low
when unused. See Note ².
A0/CS
16
16
I
Address Select 0/Chip Select
This pin functions as the hardware controlled address A0
in I²C mode. In SPI mode, this pin functions as the chip
select input (active low). This pin is internally pulled-up
and can be left unconnected when not in use. See Note ².
Notes:
1. I = Input, O = Output, P = Power
2. The IO_VDD_SEL control bit (0x0943 bit 0) selects 3.3 V or 1.8 V operation.
3. The voltage on the VDDS pin(s) determines 3.3 V or 1.8 V operation. These pins are push-pull outputs and do
not require an external pull-up resistor.
Rev. 1.0
45