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MAX7359
2-Wire Interfaced Low-EMI Key Switch Controller/GPO
Low-Voltage, Low-EMI, and Low-Supply Current Key-Switch Controller Monitors Up to 64 Keys Without External Components
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Status
| Part Number |
Status |
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MAX7359
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Active: In Production. But some versions of the family are Not Recommended for New Designs. See Ordering Information. |
Description
The MAX7359 I²C interfaced peripheral provides microprocessors with management of up to 64 key switches. Key codes are generated for each press and release of a key for easier implementation of multiple key entries. Key inputs are monitored statically, not dynamically, to ensure low-EMI operation. The switches can be metallic or resistive (carbon) with up to 5kΩ of resistance.
The MAX7359 features autosleep and autowake to further minimize the power consumption of the device. The autosleep feature puts the device in a low-power state (1µA typ) after a sleep timeout period. The autowake feature configures the MAX7359 to return to normal operating mode from sleep upon a key press.
The key controller debounces and maintains a FIFO of key-press and release events (including autorepeat, if enabled). An interrupt (active-low INT) output can be configured to alert key presses either as they occur, or at maximum rate.
Any of the column drivers (COL2/PORT2–COL7/PORT7) or the active-low INT, if not used, can function as a general-purpose output (GPO).
The MAX7359 is offered in small, 24-pin TQFN (3.5mm x 3.5mm) and 25-bump WLP (2.31mm x 2.31mm) packages for cell phones, pocket PCs, and other portable consumer electronic applications. The MAX7359 operates over the -40°C to +85°C temperature range.
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Data Sheet
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An evaluation kit is available: MAX7359EVKIT NOTE: This product uses the following:MAX7359 EVKIT Software
Key Features
- Optional Key Release Detection on All Keys
- Monitor Up to 64 Keys
- +1.62V to +3.6V Operation
- Autosleep and Autowake to Minimize Current Consumption
- Under 1µA Sleep Current
- FIFO Queues Up to 16 Debounced Key Events
- Key Debounce Time User Configurable from 9ms to 40ms
- Low-EMI Design Uses Static Matrix Monitoring
- Hardware Interrupt at the FIFO Level or at the End of Definable Time Period
- Up to Seven Open-Drain Logic Outputs Available Capable of Driving LEDs
- 400kbps, 5.5V-Tolerant, 2-Wire Serial Interface
- Selectable 2-Wire, Serial-Bus Timeout
- Four I²C Address Choices
- Small, 24-Pin TQFN Package (3.5mm x 3.5mm) , or 25-Pin WLP Package (2.31mm x 2.31mm)
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Applications/Uses
- Cell Phones
- Handheld Games
- PDAs
- Portable Consumer Electronics
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Key Specifications:
| Keyswitch Controllers |
| Part Number |
Interface |
Keys |
ISUPPLY
(µA) |
ISHUTDN
(µA) |
Interr. Out |
Key Scan I2C Slave IDs |
GPIO |
VSUPPLY
(V) |
Package/Pins |
Budgetary Price |
| max |
typ |
typ |
See Notes |
| MAX7359 |
Serial 2-Wire 400kbit |
64 |
25 |
1 |
Yes |
4 |
6 GPO |
1.62 to 3.6 |
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$2.62 @1k |
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See All Keyswitch Controllers (5)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Application Circuit
Application Notes
Product Guides
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX7359BETG+
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NRND |
TQFN;24 pin;13 mm²
Outline Drawing:21-0188 (PDF)
Land Pattern: 90-0122 (PDF)
Use pkgcode/variation: T243A3+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX7359BETG+T
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NRND |
TQFN;24 pin;13 mm²
Outline Drawing:21-0188 (PDF)
Land Pattern: 90-0122 (PDF)
Use pkgcode/variation: T243A3+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX7359ETG+
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Active |
TQFN;24 pin;13 mm²
Outline Drawing:21-0188 (PDF)
Land Pattern: 90-0122 (PDF)
Use pkgcode/variation: T243A3+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX7359ETG+G47
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Active |
QFN;
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX7359ETG+T
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Active |
TQFN;24 pin;13 mm²
Outline Drawing:21-0188 (PDF)
Land Pattern: 90-0122 (PDF)
Use pkgcode/variation: T243A3+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX7359ETG+TG47
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Active |
TQFN;24 pin;13 mm²
Outline Drawing:21-0188 (PDF)
Land Pattern: 90-0122 (PDF)
Use pkgcode/variation: T243A3+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX7359EWA+T
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Active |
WLP;25 pin;4.7 mm²
Outline Drawing:21-0453 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: W252F2+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Information Index
Document Ref.: 19-0850
Rev 4;
2010-08-25
This page last modified: 2011-02-02
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