1 Kernel driver powr1220 1 Kernel driver powr1220
2 ====================== 2 ======================
3 3
4 Supported chips: 4 Supported chips:
5 5
6 * Lattice POWR1220AT8 6 * Lattice POWR1220AT8
7 7
8 Prefix: 'powr1220' 8 Prefix: 'powr1220'
9 9
10 Addresses scanned: none 10 Addresses scanned: none
11 11
12 Datasheet: Publicly available at the Latti 12 Datasheet: Publicly available at the Lattice website
13 13
14 http://www.latticesemi.com/ 14 http://www.latticesemi.com/
15 15
16 Author: Scott Kanowitz <scott.kanowitz@gmail.co 16 Author: Scott Kanowitz <scott.kanowitz@gmail.com>
17 17
18 Description 18 Description
19 ----------- 19 -----------
20 20
21 This driver supports the Lattice POWR1220AT8 c 21 This driver supports the Lattice POWR1220AT8 chip. The POWR1220
22 includes voltage monitoring for 14 inputs as w 22 includes voltage monitoring for 14 inputs as well as trim settings
23 for output voltages and GPIOs. This driver imp 23 for output voltages and GPIOs. This driver implements the voltage
24 monitoring portion of the chip. 24 monitoring portion of the chip.
25 25
26 Voltages are sampled by a 12-bit ADC with a st 26 Voltages are sampled by a 12-bit ADC with a step size of 2 mV.
27 An in-line attenuator allows measurements from 27 An in-line attenuator allows measurements from 0 to 6 V. The
28 attenuator is enabled or disabled depending on 28 attenuator is enabled or disabled depending on the setting of the
29 input's max value. The driver will enable the 29 input's max value. The driver will enable the attenuator for any
30 value over the low measurement range maximum o 30 value over the low measurement range maximum of 2 V.
31 31
32 The input naming convention is as follows: 32 The input naming convention is as follows:
33 33
34 ============== ======== 34 ============== ========
35 driver name pin name 35 driver name pin name
36 ============== ======== 36 ============== ========
37 in0 VMON1 37 in0 VMON1
38 in1 VMON2 38 in1 VMON2
39 in2 VMON3 39 in2 VMON3
40 in2 VMON4 40 in2 VMON4
41 in4 VMON5 41 in4 VMON5
42 in5 VMON6 42 in5 VMON6
43 in6 VMON7 43 in6 VMON7
44 in7 VMON8 44 in7 VMON8
45 in8 VMON9 45 in8 VMON9
46 in9 VMON10 46 in9 VMON10
47 in10 VMON11 47 in10 VMON11
48 in11 VMON12 48 in11 VMON12
49 in12 VCCA 49 in12 VCCA
50 in13 VCCINP 50 in13 VCCINP
51 ============== ======== 51 ============== ========
52 52
53 The ADC readings are updated on request with a 53 The ADC readings are updated on request with a minimum period of 1s.
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