Overview
Information | 1-Channel Integrated UART and RS-485 Transceiver |
---|---|
Data Bus Interface | Intel, Motorola |
# of Channels | 1 |
RS-232 Tx/Rx | |
Max Data Rate 5V/3.3V (Mbps) | 8/8 |
Tx/Rx FIFO (Bytes) | 64 |
FIFO Level Counters | ✔ |
Selectable/ Programable Trigger Levels | P |
Auto Flow Control | |
IrDA Sup | |
5V Tolerant Inputs | ✔ |
Supply Voltage Range VCC (V) | 3.3 to 5 |
Temperature Range (°C) | -40 to 85 |
Package | QFN-40 |
The XR19L400 (L400) is a highly integrated device that combines a full-featured single channel Universal Asynchronous Receiver and Transmitter (UART) and RS-485 transceivers. The L400 is designed to operate with a 3.3V to 5V power supply. The L400 is fully compliant with RS-485 Standards.
The L400 operates in four different modes: Active, Partial Sleep, Full Sleep and Power-Save. Each mode can be invoked via hardware or software. Upon power-up, the L400 is in the Active mode where the UART and RS-485 transceiver function normally. In the Partial Sleep mode, the internal crystal oscillator of the UART or charge pump of the RS-485 transceiver is turned off. In Full Sleep mode, both the crystal oscillator and the charge pump are turned off. While the UART is in the Sleep mode, the Power-Save mode isolates the core logic from the control signals (chip select, read/write strobes, address and data bus lines) to minimize the power consumption. The RS-485 receivers remain active in any of these four modes.
- Meets true RS-485 Standards from +3.0V to +5.5V operation
- Up to 8 Mbps data transmission rate
- 45us sleep mode exit (charge pump to full power)
- ESD protection for RS-485 I/O pins at
- +/-15kV - Human Body Model
- +/-15kV - IEC 61000-4-2, Air-Gap Discharge
- +/- 8kV - IEC 61000-4-2, Contact Discharge
- Software compatible with industry standard 16550 UART
- Intel/Motorola bus select
- Complete modem interface
- Sleep and Power-save modes to conserve battery power
- Wake-up interrupt upon exiting low power modes
- Pb-Free, RoHS Compliant Versions Offered
- Battery-Powered Equipment
- Handheld and Mobile Devices
- Handheld Terminals
- Industrial Peripheral Interfaces
- Point-of-Sale (POS) Systems
Documentation & Design Tools
Type | Title | Version | Date | File Size |
---|---|---|---|---|
Data Sheets | XR19L400 Single Channel Integrated UART and RS-485 Transceiver | 1.0.4 | May 2018 | 2.7 MB |
Application Notes | AN-204, UART Sleep Mode | 1.0.0 | June 2010 | 515.8 KB |
Product Brochures | Interface Brochure | R01 | June 2024 | 3.6 MB |
Schematics & Design Files | PCI Eval Board Schematic | 2.0.0 | August 2007 | 218.4 KB |
Quality & RoHS
Part Number | RoHS | Exempt | RoHS | Halogen Free | REACH | TSCA | MSL Rating / Peak Reflow | Package |
---|---|---|---|---|---|---|---|
XR19L400IL40TR-F | N | Y | Y | Y | Y | L3 / 260ᵒC | QFN40 6x6 OPT1 |
Click on the links above to download the Certificate of Non-Use of Hazardous Substances.
Parts & Purchasing
Part Number | Pkg Code | Min Temp | Max Temp | Status | Suggested Replacement | PDN |
---|---|---|---|---|---|---|
XR19L400IL40-F | QFN40 6x6 OPT1 | -40 | 85 | OBS | XR19L400IL40TR-F | |
XR19L400IL40TR-F | QFN40 6x6 OPT1 | -40 | 85 | OBS |
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
Packaging
Pkg Code | Details | Quantities | Dimensions |
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QFN40 6x6 OPT1 |
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Notifications
FAQs & Support
Search our list of FAQs for answers to common technical questions.
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Please check that all the following conditions are satisfied first.
- no interrupts pending (ISR bit-0 = 1)
- modem inputs are not toggling (MSR bits 0-3 = 0)
- RX input pin is idling HIGH • divisor (the value in DLL register) is non-zero
- TX and RX FIFOs are empty
Be sure sleep mode bit has been set to 1. If there are multiple UART channels, the sleep conditions must be true for all channels.
See more on Sleep Mode in AN204 UART Sleep Mode.
Yes. Note: some devices do have powersave mode. If UART goes into powersave mode, then the registers are not accessible.
See more on Sleep Mode in AN204 UART Sleep Mode.
Read LSR register to check whether the UART receives the data or not.
- If LSR value is 0x60, it means that either UART receiver FIFO doesn’t receive the data or the data in receiver FIFO has been read out before the read of LSR.
- If LSR value is 0x00, it means data is still in the THR (clock doesn’t oscillate to transmit data).
- If LSR value is 0xFF, it means either UART is in powersave mode or UART is powered off. For those devices with powersave mode, be sure that UARTS are not in powersave mode.
See more on Sleep Mode in AN204 UART Sleep Mode.
- Check whether the register set can be accessed.
- Check whether the crystal is oscillating fully.
- Check whether the data can be transmitted in internal loopback mode.
See more on Sleep Mode in AN204 UART Sleep Mode.