BU97600XXX Datasheet, PDF (31/63 Pages) Rohm – AEC-Q100 Qualified

BU97600xxx Series
Datasheet
Output Data
1. KD1 TO KD20: KEY DATA
When a key matrix of up to 20 keys is formed from the KS1 to KS5 output pins and the KI1 to KI4 input pins and one of
those keys is pressed, the key output data corresponding to that key will be set to 1. The table shows the relationship
between those pins and the key data bits.
Item
KI1
KI2
KI3
KI4
KS1
KD1
KD2
KD3
KD4
KS2
KD5
KD6
KD7
KD8
KS3
KD9
KD10
KD11
KD12
KS4
KD13
KD14
KD15
KD16
KS5
KD17
KD18
KD19
KD20
2. SA: Sleep Acknowledge Data
This output data is set to the state when the key is pressed. In that case SDO 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
Sleep mode is set up by setting the BU0 to BU2 in the control data to 1. The segment outputs will all go low and the common
outputs will also go low, and the oscillator on the OSC pin will stop (it will be started by a key press). This reduces power
dissipation. This mode is cleared by sending control data with all the BU0 to BU2 set to 0. However, note that the S5/P1/G1 to
S20/P16/G16 outputs can be used as general-purpose output ports according to the state of the P0 to P4 control data bits, even
in sleep mode. (See Control Data Functions.)
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