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L9374LF Datasheet(PDF) 61 Page - STMicroelectronics

Part # L9374LF
Description  Four channel valve driver
PDF  80 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9374LF Datasheet(HTML) 61 Page - STMicroelectronics

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DocID025414 Rev 1
61/80
L9374LF
Programmers guide
79
5.1.5
Duration registers (address 4 and 5)
The output can be driven in two stages by one SPI transfer, a duty cycle for a duration and
then a second duty cycle. These registers provide the initial duration information. Two
duration values are available in each register.
The duration bit resolution depends on the synchronization timer RESET_VALUE MSB:
5.1.6
Duty cycle register (address 6 to 9)
The value of these registers represent the outputs Q1 and Q2 set point duty cycles. Address
6 and 8 provide the initial duty cycle used during the duration specified in the duration
register (address 4). Addresses 7 and 9 provide the duty cycles used after the duration
specified in address 4 has expired.
MSB
LSB
0100
x
D_Q2
D_Q1
Parit
y
0101
x
D_Q4
D_Q3
Parit
y
A3
A2
A1
A0
free
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
P
Table 48. Register duration value
Register address
Duration parameter
Number of bits
Bit location
Output
4
D_Q1
5 Bit
D4 - D0
Q1
4
D_Q2
5 Bit
D9 - D5
Q2
5
D_Q3
5 Bit
D4 - D0
Q3
5
D_Q4
5 Bit
D9 - D5
Q4
Table 49. Duration bit resolution
RESET_VALUE MSB (add.0, bit D9)
Resolution of duration
0
250 μs
1
500 μs
MSB
LSB
0110
x
x
DUTY1_Q1
Parit
y
0111
x
x
DUTY2_Q1
Parit
y
1000
x
x
DUTY1_Q2
Parit
y
1001
x
x
DUTY2_Q2
Parit
y
A3
A2
A1
A0
free
free
D8
D7
D6
D5
D4
D3
D2
D1
D0
P



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