Product category:
Analogue and Mixed Signal ICs
News Release from: Semtech | Subject: UR5HC703-700 and UR5HC703-IR20 SerialCoders
Edited by the Electronicstalk Editorial
Team on 01 November 2001
Keyboard encoder chips sleep when it's
quiet
Semtech has released the UR5HC703-700 SerialCoder for keyboards attachable to hand-held devices and the UR5HC703-IR20 SerialCoder for infrared keyboards.
Semtech has released the UR5HC703-700 SerialCoder for keyboards attachable to hand-held devices and the UR5HC703-IR20 SerialCoder for infrared keyboards The typical power consumption of these encoders is equal to the leakage current, about 1uA at ambient temperature
This article was originally published on Electronicstalk on 16 Jul 2001 at 8.00am (UK)
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Both SerialCoder ICs are offered in 32-pin LQFP packages that require few external components to complete the application circuits.
The UR5HC703-700 is designed for use in a keyboard that can be attached to and powered by the RS-232 serial interface of a handheld device, such as a PDA, handheld PC, or cellular telephone.
The UR5HC703-IR20 is designed for use in a battery-powered keyboard that sends data to its host device using standard infrared communication (IrDA).
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The UR5HC703-700 and the UR5HC703-IR20 achieve exceptional power savings because they power down whenever inactive, even between keystrokes, a process transparent to the host device; when a key is pressed, the IC wakes up without losing any key data.
Both devices also power down automatically to save power when the same key or group of keys remains pressed for over ten minutes.
The UR5HC703-700 uses a proprietary protocol (patent pending - specification available under NDA to customers and driver developers) for two-way communication with the host device.
This protocol makes significant power savings on the host device easy, by indicating to the host device when it can lower its power consumption to a minimum.
This flexible protocol can also accommodate additional types of data if desired, such as position data from a pointing stick embedded in the keyboard.
The operation of these SerialCoder ICs is independent of the keyboard layout.
Both ICs incorporate a robust algorithm for discarding "phantom" or "ghost" key presses.
The UR5HC703-700 scans a keyboard matrix of up to 8 rows and 14 columns.
The UR5HC703-IR20 scans a keyboard matrix of up to 8 rows and 16 columns.
"These new SerialCoder ICs provide a robust, feature-rich keyboard encoder in a complete solution with low development cost that shortens time-to-market for developers", stated Mike Alwais, director of the Human Interface Device (HID) and System Management group at Semtech.
"By offering both products, we grant designers the flexibility to incorporate either an attachable or cordless keyboard depending upon their need or application".
The UR5HC703-700 and the UR5HC703-IR20 are available now.
For production quantities of 1000 pieces, prices start at $5.65 for the UR5HC703-700 and $5.90 for the UR5HC703-IR20.
Evaluation kits for each part are also available.
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