MAX7370ETG+ by Analog Devices

8 x 8 Key-Switch Controller and LED Driver/GPIOs with I²C Interface and High Level of ESD Protection

Status: Active
Series: MAX7370
RoHS: Unknown
View Datasheet Manufacturer Site View Pricing & Stock

The MAX7370 I²C-interfaced peripheral provides microprocessors with management of up to 64 key switches, with optional GPIO and PWM-controlled LED drivers. The key-switch drivers interface with metallic or resistive switches with on-resistances up to 5kΩ. Key inputs are monitored statically, not dynamically, to ensure low-EMI operation. The IC features autosleep and autowake modes to further minimize the power consumption of the device. The autosleep feature puts the device in a low-power state (1µA typ) after a timeout period. The autowake feature configures the device to return to normal operating mode from sleep upon a keypress. The key controller debounces and maintains a FIFO buffer of keypress and release events (including autorepeat, if enabled). An interrupt (active-low INT) output can be configured to alert keypresses, as they occur, or at the maximum rate. The same index rows and columns in the device can be used as a direct logic-level translator. If the device is not used for key-switch control, all keyboard pins can be used as GPIOs. Each GPIO can be programmed to one of the two externally applied logic voltage levels. Four column ports (COL7–COL4) can also be configured as LED drivers that feature constant-current and PWM intensity control. The maximum constant-current level for each open-drain LED port is 20mA. The intensity of the LED on each open-drain port can be individually adjusted through a 256-step PWM control. The device is offered in a 24-pin (3.5mm × 3.5mm) TQFN package with an exposed pad, and small 25-bump (2.159mm x 2.159mm) wafer-level package (WLP) for cell phones, pocket PCs, and other portable consumer electronic applications. The device operates over the -40°C to +85°C extended temperature range.

Prices starting from US$1.33


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Logo for Newark Electronics Newark Electronics US$2.57
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Logo for element14 element14 US$1.80
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Logo for CoreStaff CoreStaff US$1.33
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Features

Monitors Up to 64 Keys
Integrated High-ESD Protection ±8kV IEC 61000-4-2 Contact Discharge ±15kV IEC 61000-4-2 Air-Gap Discharge
±8kV IEC 61000-4-2 Contact Discharge
±15kV IEC 61000-4-2 Air-Gap Discharge
Keyscan Uses Static Matrix Monitoring for Low-EMI Operation
Four LED Driver Pins on COL7–COL4
5V Tolerant, Open-Drain I/O Ports Capable of Constant-Current LED Drive
256-Step PWM Individual LED Intensity-Control Accuracy
Individual LED Blink Rates and Common LED Fade In/Out Rates from 256ms to 4096ms
FIFO Queues Up to 16 Debounced Key Events
User-Configurable Keypress and Release Debounce Time (2ms to 32ms)
Key-Switch Interrupt (active-low INT) on Each Debounced Event/FIFO Level, or End-of-Definable Time Period
1.62V to 3.6V Operating Supply Voltage
Individually Programmable GPIOs to Two Logic Levels
8-Channel Individual Programmable Level Translators
Provides Optional GPIOs on all ROW_ and COL_ Pins
Supports Hot Insertion
400kbps, 5.5V Tolerant I²C Serial Interface with Selectable Bus Timeout

Specifications

Interface I2C 100kbit/400kbitSerial 2-Wire 400kbit
Keys (max) 64
I2C I/F Volt. 1.6 to 3.6
ISUPPLY (µA) (typ) 35
ISHUTDN (µA) (typ) 1.5
Interrupt Output Yes
Key Scan I2C Slave IDs 4
GPIO 16 GPIO
VSUPPLY (V) 1.62 to 3.6
Package/Pins TQFN-CU/24
BudgetaryPrice (See Notes) 1.49


MAX7370ETG+ IC Sensors by Analog Devices

KEY SWITCH CTRL W/LED DRIVER TQFN-24

Status: Unknown
Series: -
RoHS: Unknown
View Datasheet Manufacturer Site View Pricing & Stock

Specifications

IC Function Key Switch Controller & LED Driver
Supply Voltage Min 1.62V
Supply Voltage Max 3.6V
IC Package Type TQFN
No. of Pins 24Pins
Operating Temperature Min -40°C
Operating Temperature Max 85°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant To Be Advised
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)

Alternative Descriptions

Key Switch Ctrl W/Led Driver, Tqfn-24 | Newark Electronics
KEY SWITCH CTRL W/LED DRIVER, TQFN-24 | element14

Frequently Asked Questions

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Is the MAX7370ETG+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

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Authorised distributors including Newark Electronics, element14, Farnell and CoreStaff have stock available or on a lead time for MAX7370ETG+ .

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