User`s manual
PK220028 s Subsystems
Sinking Drivers
JP1
JP1
Sourcing Drivers
3
12
4
34
12
Figure 3-6 illustrates the connection for the UDN2985A sourcing driver.
(Note the connections on header JP1.)
Figure 3-6. Sourcing Driver Configuration
Note the following points regarding the UDN2985A sourcing driver.
Outputs pull high (source current) when turned on.
The chips rating is 30 V and 250 mA maximum per channel,
subject to the chips thermal limits and ambient temperature.
With all channels on, each channel can source up to 170 mA
continuously (100% duty cycle) as long as the chip temperature is
less or equal to 50°C. At 70°C the current must be reduced to
140 mA or less.
Header JP1 configures the outputs for either sourcing or sinking drivers.
Table 3-3 lists the JP1 jumper configurations shown in Figure 3-7.
Figure 3-7. JP1 Digital Output
Jumper Settings
If incandescent lights are driven, use a series resistor to limit
the incoming current.
See Appendix B: Specifications for more detailed informa-
tion on the sinking and sourcing drivers.
inductive
load
Channel (
1
14
)
external
DC
UDN2985A
K
JP1
4
21
3
JP1
HV01
HV14
$
Tip
Table 3-3. JP1 High-Current Output
Jumper Settings
JP1 Setting Description
1–3, 2–4
Sinking Outputs
1–2, 3–4
Sourcing Outputs