BU9729K Datasheet, PDF (4/12 Pages) Rohm – Segment-type LCD driver

Standard ICs
BU9729K
•^{Recommended operating conditions (Ta = 25°C, VSS = 0V)}
Parameter
Symbol Min.
Typ. Max.
Power supply voltage 1
VDD
2.5
—
5.5
Power supply voltage 2
VLCD
2.5
—
5.5
Oscillation frequency
fOSC
—
36
—
Unit
V
V
kHz
Conditions
—
The condition VLCD м VC м VSS must be satisfied.
Rf = 470kΩ
•^{Electrical characteristics}
DC characteristics (unless otherwise noted, VDD = 2.5V to 5.5V, VSS = 0V, Ta = 25°C)
Parameter
Symbol Min.
Typ.
Max.
Unit
Conditions
Applicable pin
VIH1
0.8 ×
—
VDD
Input high level voltage
V
VDD
OSC1, SD, SCK, C / D, CS
—
VIL1
0
Input low level voltage
LCD driver on-resistance^∗1 RON
—
—
0.2 ×
V
—
VDD
—
30
kΩ
∆VON = 0.1V
—
SEG1 ~ 32, COM1 ~ 4
Input high level current 2 IIL2
—
—
2
µA
VIN = 0
OSC1, SD, SCK, C / D, CS
Input low level current IIH
–2
—
—
µA
VIN = VDD
OSC1, SD, SCK, C / D ,CS
Input capacitance
CI
—
5
—
pF
—
SD,SCK, C / D, CS
—
0.05
1
µA
While quiescent^∗2
—
8
25
µA
When “ALL OFF” is displayed
Current consumption IDD
VDD
—
40
80
µA
For display operations^∗3
—
100
250
µA
For access operations^∗4
∗1 The internal power supply impedance is not included in the LCD driver on-resistance.
∗2 All input is fixed at either VDD or VSS.
∗3 Except for Rf = 470kΩ and OSC1, all input is fixed at VDD or VSS.
∗4 Rf = 470kΩ, fSCK = 200kHz.
AC characteristics (unless otherwise noted, VDD = 2.5V to 5.5V, VSS = 0V, Ta = 25°C)
Parameter
Symbol Min.
SCK rise time
tTLH
—
SCK fall time
tTHL
—
SCK cycle time
tCYC
800
Command wait time
tWAIT
800
SCK pulse width HIGH tWH1
300
SCK pulse width LOW
tWL1
300
Data setup time
tSU1
100
Data hold time
tH1
100
CS pulse width HIGH
tWH2
300
CS pulse width LOW
tWL2
6400
CS setup time
tSU2
100
CS hold time
tH2
100
C / D setup time
tSU3
100
C / D hold time
tH3
100
C / D-CS time^∗5
tCCH
100
C / D-SCK time^∗5
tSCH
100
∗5 Should satisfy either one of these conditions.
Typ.
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Max.
100
100
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Unit
Conditions
ns
—
ns
—
ns
—
ns
—
ns
—
ns
—
ns
—
ns
—
ns
—
ns
—
ns
—
ns
—
ns
—
ns 8th rise of SCK used as reference
ns CS rise used as reference
ns 8th fall of SCK used as reference
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