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LC75742E View Datasheet(PDF) - SANYO -> Panasonic

Part Name
Description
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LC75742E Datasheet PDF : 18 Pages
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LC75742E, LC75742W
Output Data
• KD1 to KD30: Key data
These bits represent the key output states when a key matrix with up to 30 keys is formed using the KS1 to KS6 key
scan output pins and the KI1 to KI5 key scan input pins. When a key is pressed, the bit corresponding to that key will
be set to 1. The correspondence is listed in the following table.
Item
KI1 KI2 KI3 KI4 KI5
KS1
KD1 KD2 KD3 KD4 KD5
KS2
KD6 KD7 KD8 KD9 KD10
KS3
KD11 KD12 KD13 KD14 KD15
KS4
KD16 KD17 KD18 KD19 KD20
KS5
KD21 KD22 KD23 KD24 KD25
KS6
KD26 KD27 KD28 KD29 KD30
• SA: Sleep acknowledge data
This output data is set to the state when the key was pressed. In that case DO will go to the low level. If serial data is
input during this period and the mode is set (normal mode or sleep mode), the IC will be set to that mode. SA is set to
1 in the sleep mode and to 0 in the normal mode.
Sleep Mode
The IC is set to sleep mode by setting either S0 or S1 in the control data to 1. The segment outputs and the digit outputs
are all set low, and the clock generator (oscillator circuit) is stopped (although it is restarted when a key is pressed), and
thus power dissipation is reduced. This mode is cleared by setting S0 and S1 in the control data to 0.
Key Scan Operation
• Key scan timing
The scan period is 12000T [s]. A key scan is performed twice to reliably recognize the key on/off states by verifying
that the key data for the two scans agrees. If the data agrees, the IC recognizes a key press and 25600T [s] after the
start of key scan execution issues a key scan data read request by outputting a low level from DO. If the key data does
not agree and a key was pressed at the later scan, the IC executes another key scan operation. Note that this means that
this IC cannot recognize a key press shorter than 25600T [s].
Note *: The high-level and low-level states in sleep mode are set according to the control data S0 and S1. Key scan output signals are not output from pins
set to the “L” state.
No. 6142-9/18
 

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