SWRS152 Data sheet

SWRS152N June 2013 – April 2021 WL1801MOD , WL1805MOD , WL1831MOD , WL1835MOD

PRODUCTION DATA

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)

MOC|100

Thermal pad, mechanical data (Package|Pins)

Orderable Information

swrs152n_pm

8.19.7.1 UART 4-Wire Interface – H4

The interface includes four signals:

Flow control between the host and the device is byte-wise by hardware.

When the UART RX buffer of the device passes the flow-control threshold, the buffer sets the UART_RTS signal high to stop transmission from the host. When the UART_CTS signal is set high, the device stops transmitting on the interface. If HCI_CTS is set high in the middle of transmitting a byte, the device finishes transmitting the byte and stops the transmission.

Figure 8-10 shows the UART timing.

Figure 8-10 UART Timing Diagram

Table 8-5 lists the UART timing characteristics.

Table 8-5 UART Timing Characteristics

PARAMETER		CONDITION	MIN	TYP	MAX	UNIT
	Baud rate		37.5		4364	Kbps
	Baud rate accuracy per byte	Receive-transmit	–2.5%		1.5%
	Baud rate accuracy per bit	Receive-transmit	–12.5%		12.5%
t3	CTS low to TX_DATA on		0.0	2.0		µs
t4	CTS high to TX_DATA off	Hardware flow control			1.0	bytes
t6	CTS high pulse duration		1.0			Bit
t1	RTS low to RX_DATA on		0.0	2.0		µs
t2	RTS high to RX_DATA off	Interrupt set to 1/4 FIFO			16.0	bytes

Figure 8-11 shows the UART data frame.

Figure 8-11 UART Data Frame