XJ128 and XJ128 Plus Printhead
XJ128 Guide to Operation
Xaar Document no: D031010302 Version A
Page 28
fixed charge/discharge timings can be provided. These must be measured on the application itself.
The VPPH should have reached the level of VDD or below before VDD is switched off.
Table 6.3 and table 6.4 show the power up and power down sequencing required by the printhead.
Please also reference figure 6.1 for timing requirements. The initial voltage supply must stabilise
before switching the second voltage supply.
On Sequence
VDD
VPPH
VPPL
nRESET
Condition
1
0V
0V
0V
ACTIVE
2
VDD
0V
0V
ACTIVE
3
VDD
VPPH
VPPL
ACTIVE
4
VDD
VPPH
VPPL
INACTIVE
t
Power on
100
ms
Table 6.3 - Power up/on sequence
Off Sequence
VDD
VPPH
VPPL
nRESET
Condition
1
VDD
VPPH
VPPL
INACTIVE
2
VDD
VPPH
VPPL
ACTIVE
3
VDD
0V
0V
ACTIVE
4
0V
0V
0V
ACTIVE
t
Power down
100
s
Table 6.4 - Power down/off sequence
Figure 6.1
–
Power on/down sequencing
t
Power down
t
Power on
VDD
VPPH/VPPL
VDD
VPPH/VPPL
Power-on sequence
Power-down sequence
1
2
3
1
2
3
4
4
nRESET
nRESET