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MAX7370EWA+ Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX7370EWA+ Datasheet(HTML) 8 Page - Maxim Integrated Products |
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8 / 37 page  ����������������������������������������������������������������� Maxim Integrated Products 8 MAX7370 8 x 8 Key-Switch Controller and LED Driver/GPIOs with I2C Interface and High Level of ESD Protection Detailed Description The MAX7370 is a microprocessor peripheral low-noise key-switch controller that monitors up to 64 key switches with optional autorepeat, and key events that are pre- sented in a 16-byte FIFO. Key-switch functionality can be traded to provide up to 16 logic inputs. The device also features 12 push-pull GPOs configured for digital I/O and four open-drain GPOs configurable as constant- current outputs for LED applications up to 5V. The device supports a second 1.62V to 3.6V power supply for level translation. The second logic supply voltage (VLA) must be set equal to or higher than VCC. The device features an automatic sleep mode and auto- matic wakeup that further reduce supply current con- sumption. The device can be configured to enter sleep mode after a programmable time following a key event. The FIFO content is maintained and can be read in sleep mode. The device does not enter autosleep when a key is held down. The autowake feature takes the device out of sleep mode following a keypress. Autosleep and autowake are enabled/disabled by programming the configuration register (0x01). To prevent overloading the microprocessor with too many interrupts, interrupt requests can be triggered after a programmable number of FIFO entries have been exceeded, and/or after a set period of time (0x05). The key-switch status is checked by reading the key-switch FIFO. A 1-byte read access returns both the next key event in the FIFO (if there is one) and the FIFO status. Up to four of the key-switch outputs function as open- drain GPOs capable of driving additional LEDs when the application requires fewer keys to be scanned. For each key-switch output used as a GPO, the number of moni- tored key switches reduces by eight. The device meets ESD requirements for ±8kV contact dis- charge and 15kV Air-Gap Discharge on all key-switch pins. Initial Power-Up On power-up, all control registers are set to power-up values (Table 1) and the device is in sleep mode. Table 1. Register Address Map and Power-Up Conditions ADDRESS CODE (hex) READ/WRITE POWER-UP VALUE (hex) REGISTER FUNCTION DESCRIPTION 0x00 Read only 0x3F Keys FIFO Read FIFO keyscan data out 0x01 R/W 0x0B Configuration Power-down, key-release enable, autowake, and I2C timeout enable 0x02 R/W 0xFF Debounce Key debounce time setting 0x03 R/W 0x00 Interrupt Key-switch interrupt and INT frequency setting 0x05 R/W 0x00 Key repeat Delay and frequency for key repeat 0x06 R/W 0x07 Sleep Idle time to autosleep 0x30 R/W 0xFF Key-switch size Keyscan switch array size 0x31 R/W 0x00 LED driver enable LED driver enable register 0x34 R/W 0x00 GPIO direction 1 GPIO input/output control register 1 for ROW7–ROW0 0x35 R/W 0x00 GPIO direction 2 GPIO input/output control register 2 for COL7–COL0 0x36 R/W 0xFF GPO output mode 1 GPO open-drain/push-pull output setting for ROW7–ROW0 0x37 R/W 0x0F GPO output mode 2 GPO open-drain/push-pull output setting for COL7–COL0 |
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