BU97540KV-M Datasheet, PDF (40/70 Pages) Rohm – Multi-function Segment Drivers

BU97540KV-M
Output Data
1.KD1 TO KD30: KEY DATA
When a key matrix of up to 30 keys is formed from the KS1 to KS6 output pins and the KI1 to KI5 input pins and one of
those keys are 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
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
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 S1/P1/G1 to
S9/P9/G9 outputs can be used as general-purpose output ports according to the state of the P0 to P3 control data bits, even
in sleep mode. (See Control Data Functions.)
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29.Jun.2015 Rev.002