bu9768ak ROHM Co. Ltd., bu9768ak Datasheet - Page 18

• Manufacturer Part Number: bu9768ak
• Description: Driver Segmented Module With Input Function
• Manufacturer: ROHM Co. Ltd.

(4) RST and display control
After the power supply has been turned on, because the internal data of the BU9768AK / BU9768AKV (D
unstable, RST goes LOW at the same time that the power supply is turned on. While RST is LOW, data is transmit-
ted using the microcomputer, and when data transmission has been completed, RST can be set to HIGH to prevent
meaningless displays. (For the states of control codes when the power supply is turned on, see page 11.)
In the circuit example shown above, the value of t1 is determined by the value of the capacitor and resistor. The
value should be set in such a way that the constant determined by the capacitor and resistor is the initialized commu-
nication time + t2.
18
Standard ICs
Internal data
Display
V
RST
CS
DD
Fig. 13 Communication, display and RST timing
t1: Communication time
t2: 10 s min.
Fig. 14 Example of RST pin processing
Unstable
Display and control data
t
1
R
C
GND
t
2
BU9768AK / BU9768AKV
RST
V
V
IL
DD
Assured
Display
1
to D
126
) is