Epson S5U1C33001H Manual page 23

Usage Precautions
When using the S5U1C33001H, observe the precautions described below.
• Connecting and disconnecting equipment
Before attaching or removing the target system and cables, and setting the DIP switch and jumper, be sure to turn off the
power to the host computer, S5U1C33001H, and target system. Failure to take this precaution may result in equipment
malfunction.
• Powering on/off
After turning off the power to the S5U1C33001H, wait at least 10 seconds before turning the power on again. If the
power is turned on immediately after it is turned off, the S5U1C33001H may not be initialized correctly in a power-on
reset, and may cause a malfunction.
• Connecting the target system
The signals connected to the S5U1C33001H are very high-speed signals, so the target connector must be mounted
within 5 cm from the S1C33xxx. If there is more distance between the connector and the S1C33xxx chip, the
S5U1C33001H may not work properly. Furthermore, be sure to use one of the supplied 30-pin, 10-pin and 4-pin cables
for connecting the target system to the S5U1C33001H. Using two cables (30-pin and 10-pin or 4-pin cables) simulta-
neously or using another cable may cause a malfunction.
• Operation of the S5U1C33001H system
The S5U1C33001H can work by connecting a target system in which the actual S1C33xxx chip is mounted. Since the
S5U1C33001H package does not include any board equivalent to a target system, please prepare separately.
• Wiring between the S1C33xxx chip and target connector
When wiring the S1C33xxx chip to the target connector for connecting the S5U1C33001H, insert a 33 Ω resistor in
series between the S1C33xxx chip DSIO pin and the connector. This resistor must be placed as close to the S1C33xxx
chip as possible. If the reset line is not connected, the system can be operated without this 33 Ω resistor. However, we
recommend inserting this resistor to prevent malfunctions. The other pins are connected directly. The total length of the
line must be under 5 cm. Forcible breaks are applied by inputting a low-level to the DSIO pin. Although this signal is
pulled up through an about 100 kΩ internally, when not debugging, we recommend either removing the 33 Ω resistor to
reduce noise and other problems or pulling this line up to the V
• Reset request
Do not reset the target system while the target program execution is suspended as the S5U1C33001H will be unable to
operate normally.
• Notes on target system power supply
The allowable voltage range for the signals input from the target system is 0 to 3.6 V. The S5U1C33001H may fail if
voltages that exceed this range are input. Therefore, target systems to be connected to the S5U1C33001H must be
designed so that voltages outside this range are not applied. Take special care in designing the target system power
supply, and design the target system so that overvoltages are not applied to the S5U1C33001H when the target system
power supply is turned on or off.
• Notes on S5U1C33001H power supply
When using the S5U1C33001H, install circuit breakers that automatically disconnect both conductors in the local power
mains, and connect the S5U1C33001H power supply line to a power line protected in that manner.
Within 5 cm
DCLK
DSIO
DST[2:0]
S1C33xxx
DPCO
DTS[4:0]
DTD[7:0]
DBT
Place a 33 Ω resistor in series at a location
as close to the S1C33xxx as possible.
Figure 17 Wiring between S1C33xxx and Target Connector
S5U1C33001H
level (the core voltage).
DD
Target
connector
(Ver. 4)
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