Cirrus Logic CS1631 - Manual (Page 45)

CS1630/31
DS954F3 45
6.35 Configuration 53 (Config53) – Address 85
7 6 5 4 3 2 1 0
BOP_INTEG2 BOP_INTEG1 BOP_INTEG0 BOP_THRES3 BOP_THRES2 BOP_THRES1 BOP_THRES0 BOOST_ON
Number Name Description
[7:5] BOP_INTEG[2:0]
Sets the leaky integrator output threshold for declaring a boost output protec-
tion (BOP) fault. The BOP fault signal is averaged continuously using a leaky
integrator and if the averaged value exceeds the leaky integrator output
threshold a BOP fault is declared. When V
BST
exceeds the set threshold
BOP_THRES[3:0], the leaky integrator uses these parameters: feedback
coefficient = 63/64; sample rate = 12.5kHz; input = 8.
000 = BOP fault trips immediately when V
BST
crosses threshold (no filter)
001 = 1
010 = 2
011 = 3
100 = 4
101 = 5
110 = 6
111 = 7
[4:1] BOP_THRES[3:0]
Configures threshold V
BOP(th)
for the BOP to be 0 to 30V above the clamp
turn-on voltage setting which is 227V for 120V IC (CS1630) and 432V for
230V IC (CS1631). The threshold value can be set from 0 to 30V in incre-
ments of 2V above the clamp turn-on voltage setting. For a 120V IC:
For a 230V IC:
This value is limited internally to 254V for 120V IC and 508V for 230V IC.
The boost overvoltage protection does not trip immediately when the boost
output voltage crosses this threshold, unless BOP_INTEG[2:0] = 0.
[0] BOOST_ON
Selects when to enable boost stage on chip power-up.
0 = Boost after eOTP measurement check for Temp
NTC
>Temp
Wakeup
1 = Boost after ADC lock without waiting for eOTP measurement to finish
V
BOP th  
BOP_THRES  [3:0] 2  227V +  =
V
BOP th  
BOP_THRES  [3:0] 2  432V +  =