BU21021GUL Datasheet, PDF (7/13 Pages) Rohm – 4-wire resistive Touch Screen Controller

BU21021GUL
●HOST-I/F timing specification (4-wire SPI)
(Note: SCK=SCL_SCK, SI=SDA_SI, CSB=SEL_CSB and SO=SO)
4-wire SPI has the burst write and burst read.
The automatic address increment is done until 0x5F. After address 0x5F is accessed, it is not changed.
Datasheet
CSB
SCK
SI
write
SI
read
SO
read
t1
t2
t3
t4
t5
t8
t9
t6
t7
WA6 WA5 WA4 WA3 WA2 WA1 WA0 WD7 WD6 WD5 WD4 WD3 WD2 WD1 WD0 WD7 WD6
W/R
Register address
Write (WA)
Write (WA + 1)
WD1 WD0
Write (WA + n)
RA6 RA5 RA4 RA3 RA2 RA1 RA0
W/R
Register address
HiZ
RD7 RD6 RD5 RD4 RD3 RD2 RD1 RD0 RD7 RD6
RD1 RD0 RD7
HiZ
Read (RA)
Read (RA + 1)
Figure 5. Timing specification (4-wire SPI)
Read (RA + n)
Table 1. Timing Requirements: 4-wire SPI at VDD = 3.0V, Ta = 25℃
Parameter
Symbol
Min
Rating
Typ
Max
CSB setup time
t₁
30
-
-
‘H’ width of SCK
t₂
30
-
-
‘L’ width of SCK
t₃
30
-
-
SI setup time
t₄
20
-
-
SI holding time
t₅
20
-
-
CSB holding time
t₆
20
-
-
‘H’ width of CSB
t₇
50
-
-
SO output delay time
t₈
-
-
15
SCK frequency
t₉
-
-
15
Unit
ns
ns
ns
ns
ns
ns
ns
ns
MHz
Conditions
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TSZ22111・15・001
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TSZ02201-0Y1Y0F300060-1-2
19.Jun.2012 Rev.001