PAC1720 Datasheet, PDF (27/47 Pages) SMSC Corporation – Dual High-Side Current Sense Monitor with Power Calculation

Dual High-Side Current Sense Monitor with Power Calculation
Datasheet
Bit 0 - CH1_VMEAS_DIS - Disables V_SOURCE measurement for current sense channel 1.
„ ‘0’ (default) - The device is measuring V_SOURCE voltage for current sense channel 1.
„ ‘1’ - The device is not measuring the V_SOURCE voltage. It will update CH1 VSOURCE Voltage
Registers when a One-Shot command is given.
5.3 Conversion Rate Register
ADDR R/W
01h
R/W
REGISTER
Conversion
Rate
Table 5.3 Conversion Rate Register
B7 B6 B5 B4 B3 B2
-
-
-
-
-
-
B1 B0
CONV_
RATE
DEFAULT
03h
The Conversion Rate Register controls how often V_SENSE, V_SOURCE, P_RATIO, and the status bits are
updated in the Active state (see Section 4.2.1, "Conversion Rate").
Bits 1 - 0 - CONV_RATE - Determines the conversion rate as shown in Table 5.4.
APPLICATION NOTE: The conversion rate should only be updated when the PAC1720 is in the Standby state. To
do this, disable the measurements in the Configuration Register 00h, wait for the conversion
cycle to complete by monitoring the XMEAS_DIS bits in 00h until they stay set to ‘1’, change
the conversion rate, and then enable the desired measurements.
Table 5.4 Conversion Rate for Measurement
CONV_RATE[2:0]
1
0
0
0
0
1
1
0
1
1
CONVERSION RATE
1 per sec
2 per sec
4 per sec
Continuous (default)
5.4 One-Shot Register
ADDR
02h
R/W
W
Table 5.5 One-Shot Register
REGISTER B7 B6 B5 B4 B3
B2
B1
B0
One-Shot Writing to this register initiates a single conversion cycle. Data
is not stored in this register, so it always reads 00h.
DEFAULT
00h
When the device is in the Standby state, writing to the One-Shot Register will initiate a conversion
cycle and update all measurements (see Section 4.2, "Conversion Cycle").
APPLICATION NOTE: Do not write to the One-Shot Register when the PAC1720 is in the Active state (i.e., when
any measurements are enabled in the Configuration Register 00h).
SMSC PAC1720
27
SMSC CONFIDENTIAL DATASHEET
Revision 1.1 (12-08-11)