EM357-RTB Ember, EM357-RTB Datasheet - Page 76

• Manufacturer Part Number: EM357-RTB
• Description: IC RF TXRX ZIGBEE 192KB 48QFN
• Manufacturer: Ember

Specifications of EM357-RTB

• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: General Purpose
• Power - Output: 5dBm
• Sensitivity: -100dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 26mA
• Current - Transmitting: 31mA
• Data Interface: PCB, Surface Mount
• Memory Size: 192kB Flash, 12kB RAM
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q5059680

8
8.1
Serial Controllers
Overview
The EM35x has two serial controllers, SC1 and SC2, which provide several options for full-duplex synchronous
and asynchronous serial communications.
Receive and transmit FIFOs allow faster data speeds using byte-at-a-time interrupts. For the highest SPI and
UART speeds, dedicated receive and transmit DMA channels reduce CPU loading and extend the allowable time
to service a serial controller interrupt. Polled operation is also possible using direct access to the serial data
registers. Figure 8-1 shows the components of the serial controllers.
Note: The notation SCx means that either SC1 or SC2 may be substituted to form the name of a specific
register or field within a register.
SPI (Serial Peripheral Interface), master or slave
TWI (Two Wire serial Interface), master only
UART (Universal Asynchronous Receiver/Transmitter), SC1 only
Receive and transmit FIFOs and DMA channels, SPI and UART modes
SCx RX DMA
SCx TX DMA
channel
channel
SCx Interrupt
SCx_MODE
SCx_DATA
SCx_DMACTRL
SCx_DMASTAT
Controller
SC1
only
DMA
Figure 8-1. Serial Controller Block Diagram
0
1
2
3
UART
SPI
TWI
OFF
SCx_RXCNTSAVED
Final
8-1
SCx_RXCNTA/B
SC1_UARTPER/FRAC
TX-FIFO
RX-FIFO
SCx_TX/RXBEGA/B
SCx_TX/RXENDA/B
SCx_RATELIN/EXP
SCx_RXERRA/B
SC1_UARTSTAT
SCx_TWICTRL1
SCx_TWICTRL2
SC1_UARTCFG
SCx_TWISTAT
INT_SCxFLAG
SCx_SPISTAT
INT_SCxCFG
SCx_SPICFG
SCx_TXCNT
Clock Generator
Baud Generator
TWI Master
SPI Master
EM351 / EM357
Controller
SPI Slave
Controller
Controller
Controller
UART
TXD
RXD
nRTS
nCTS
MISO
SCLK
nSSEL
SCL
SDA
MOSI
120-035X-000G