bd6758mwv ROHM Co. Ltd., bd6758mwv Datasheet - Page 30

• Manufacturer Part Number: bd6758mwv
• Description: 5ch System Lens Drivers For Digital Still Cameras 
• Manufacturer: ROHM Co. Ltd.

10)
11)
12)
13)
14)
8)
9)
ASO
Thermal shutdown circuit
Serial data input
Power saving terminal
Testing on application board
Application example
Regarding input pin of the IC
When using the IC, set the output transistor for the motor so that it does not exceed absolute maximum ratings or ASO.
If the junction temperature (Tjmax) reaches 175°C, the TSD circuit will operate, and the coil output circuit of the motor will open. There is a temperature
hysteresis of approximately 25°C (BD6373GW and BD6873KN Typ.) and 25°C (BD6753KV Typ.). The TSD circuit is designed only to shut off the IC in
order to prevent runaway thermal operation. It is not designed to protect the IC or guarantee its operation. The performance of the IC’s characteristics is
not guaranteed and it is recommended that the device is replaced after the TSD is activated.
In the BD6370GUL, SDATA input string start with MSB first. A low level should be input to the TEST bit at all times. A high signal may cause the IC to
malfunction. The serial settings are reset during standby mode operation and whenever the UVLO or TSD circuits are operating.
It is the prohibited bit of MODExx input. Don’t input the prohibited bit at all times. (See the Serial Register Bit Map; p.12/32)
In the case of the resemblance drive mode (MODE13=1 and/or MODE23=1), MODE3B, MODE3A, IN3B, and IN3A bits are “don’t care”. Because
OUT1A-OUT3A is driven by MODE12B, MODE12A, IN1B, and IN1A bits, and INPUT1 terminal control. In the same condition, MODE12B, MODE12A,
IN2B, and IN2A bits, and INPUT2 terminal drive OUT2A-OUT3B. And set the serial data as DAC12 = DAC3, if not, Output high voltage is different value
between OUT1A and OUT3A, and/or OUT2A and OUT3B.
In the case of Full-ON mode for ch1 to ch3, input serial data of each Constant-Voltage setting D/A Converter (DAC12 and DAC3) to be full bits high.
In the ch4, as it set Constant-Voltage mode, input serial data of Constant-Current setting D/A Converter (DACI4) to be full bits high. As it set
Constant-Current mode, input serial data of Constant-Voltage setting D/A Converter (DACV4) to be full bits high, while as it set Full-ON mode, input
serial data of both D/A Converters to be full bits high. In the settings of Constant-Voltage or Full-ON mode, no need to connect the external resistance
for output current detection in RNF4 pin.
Be cancelled power saving mode after turned on power supply VCC and VM, because of PS terminal combines power saving with serial reset function.
If the case of power saving terminal always shorted power supply terminal, reset function may not be well, and it may cause the IC to malfunction.
When testing the IC on an application board, connecting a capacitor to a pin with low impedance subjects the IC to stress. Always discharge capacitors
after each process or step. Always turn the IC's power supply off before connecting it to, or removing it from a jig or fixture, during the inspection
process. Ground the IC during assembly steps as an antistatic measure. Use similar precaution when transporting and storing the IC.
The application circuit is recommended for use. Make sure to confirm the adequacy of the characteristics. When using the circuit with changes to the
external circuit constants, make sure to leave an adequate margin for external components including static and transitional characteristics as well as
dispersion of the IC.
This monolithic IC contains P
intersection of these P layers with the N layers of other elements, creating a parasitic diode or transistor. For example, the relation between each
potential is as follows:
Parasitic elements can occur inevitably in the structure of the IC. The operation of parasitic elements can result in mutual interference among circuits,
operational faults, or physical damage. Accordingly, methods by which parasitic elements operate, such as applying a voltage that is lower than the
GND (P substrate) voltage to an input pin, should not be used.
Parasitic element
Pin A
N
P
+
When GND > Pin A, the P-N junction operates as a parasitic diode.
When GND > Pin B, the P-N junction operates as a parasitic diode and transistor.
N
GND
P
P substrate
P
+
+
isolation and P substrate layers between adjacent elements to keep them isolated. P-N junctions are formed at the
N
Resistor
Pin A
Fig.53 Example of Simple IC Architecture
Parasitic
element
30/32
Parasitic element
N
Pin B
P
+
C
B
N
E
GND
P
P substrate
Transistor (NPN)
P
+
N
GND
Other adjacent
elements
Pin B
B
C
E
GND
Parasitic
element