SI7015-A20 Datasheet, PDF (5/39 Pages) Silicon Laboratories – DIGITAL IC HUMIDITY AND TEMPERATURE SENSOR

Si7015-A20
Table 2. General Specifications (Continued)
1.9 < VDD < 3.6 V; TA = –40 to 85 °C (G grade) or 0 to 70 °C (F grade); default conversion time unless otherwise noted.
Parameter
Symbol
Test Condition¹
Min
Typ
Max Unit
Wake Up Time
t_CS From CS < VIL to ready for a temp/RH
—
—
1
ms
conversion
Power Up Time
t_PU From V_DD ≥ 1.9 V to ready for a temp/
—
RH conversion, 25°C
From V_DD ≥ 1.9 V to ready for a temp/
—
RH conversion, full temperature range
18
25
ms
—
80
ms
Notes:
1. Initiating a RH measurement will also automatically initiate a temperature measurement. The total conversion time will
be t_CONV(RH) + t_CONV(T).
2. No conversion or I²C transaction in progress. Typical values measured at 25 °C.
3. Occurs once during powerup. Duration is <5 msec.
4. Occurs during I²C commands for Read Device ID and Read Firmware Version. Duration is < 100 µs when I²C clock
speed is >100 kHz.
Table 3. I²C Interface Specifications¹
1.9 V_DD  3.6 V; T_A = 0 to 70 °C (F grade) or –40 to +85 °C (G grade) unless otherwise noted.
Parameter
Symbol
Test Condition
Min
Typ
Hysteresis
V_HYS High-to-low versus low-to- 0.05 x V_DD —
high transition
SCLK Frequency
f_SCL
—
—
SCL High Time
t_SKH
0.6
—
SCL Low Time
t_SKL
1.3
—
Start Hold Time
t_STH
0.6
—
Start Setup Time
t_STS
0.6
—
Stop Setup Time
t_SPS
0.6
—
Bus Free Time
t_BUF
Between Stop and Start
1.3
—
SDA Setup Time
t_DS
100
—
SDA Hold Time
t_DH
100
—
SDA Valid Time
t_VD;DAT From SCL low to data valid
—
—
SDA Acknowledge Valid Time t_VD;ACK From SCL low to data valid
—
—
Suppressed Pulse Width²
t_SP
50
—
Notes:
1. All values are referenced to V_IL and/or V_IH.
2. Pulses up to and including 50ns will be suppressed.
Max Unit
—
V
400 kHz
—
µs
—
µs
—
µs
—
µs
—
µs
—
µs
—
ns
—
ns
0.9
µs
0.9
µs
—
ns
Rev. 1.0
5