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SI4420-D1-FTR データシート(PDF) 11 Page - List of Unclassifed Manufacturers

部品番号 SI4420-D1-FTR
部品情報  Si4420 Universal ISM Band FSK Transceiver
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Si4420
11
CONTROL INTERFACE
Commands (or TX data) to the transceiver are sent serially. Data bits on pin SDI are shifted into the device upon the rising edge of the clock
on pin SCK whenever the chip select pin nSEL is low. When the nSEL signal is high, it initializes the serial interface. All commands consist of
a command code, followed by a varying number of parameter or data bits. All data are sent MSB first (e.g. bit 15 for a 16-bit command). Bits
having no influence (don’t care) are indicated with X. The Power On Reset (POR) circuit sets default values in all control and command
registers.
The status information or received data can be read serially over the SDO pin. Bits are shifted out upon the falling edge of CLK signal. When
the nSEL is high, the SDO output is in a high impedance state.
The receiver will generate an interrupt request (IT) for the microcontroller - by pulling the nIRQ pin low - on the following events:
 The TX register is ready to receive the next byte (RGIT)
 The FIFO has received the preprogrammed amount of bits (FFIT)
 Power-on reset (POR)
 FIFO overflow (FFOV) / TX register underrun (RGUR)
 Wake-up timer timeout (WKUP)
 Negative pulse on the interrupt input pin nINT (EXT)
 Supply voltage below the preprogrammed value is detected (LBD)
FFIT and FFOV are applicable when the FIFO is enabled. RGIT and RGUR are applicable only when the TX register is enabled. To identify the
source of the IT, the status bits should be read out.
Timing Specification
Symbol
Parameter
Minimum value [ns]
tCH
Clock high time
25
tCL
Clock low time
25
tSS
Select setup time (nSEL falling edge to SCK rising edge)
10
tSH
Select hold time (SCK falling edge to nSEL rising edge)
10
tSHI
Select high time
25
tDS
Data setup time (SDI transition to SCK rising edge)
5
tDH
Data hold time (SCK rising edge to SDI transition)
5
tOD
Data delay time
10
Timing Diagram


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